-
Bronstein, J.; Gazit, T.; Perez, O.; Bar-Ilan, J.; Aharony, N.; Amichai-Hamburger, Y.: ¬An examination of the factors contributing to participation in online social platforms (2016)
0.03
0.027920295 = product of:
0.05584059 = sum of:
0.05584059 = sum of:
0.027305232 = weight(_text_:j in 3364) [ClassicSimilarity], result of:
0.027305232 = score(doc=3364,freq=4.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.2482419 = fieldWeight in 3364, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0390625 = fieldNorm(doc=3364)
0.0050849267 = weight(_text_:a in 3364) [ClassicSimilarity], result of:
0.0050849267 = score(doc=3364,freq=8.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.12739488 = fieldWeight in 3364, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0390625 = fieldNorm(doc=3364)
0.023450429 = weight(_text_:22 in 3364) [ClassicSimilarity], result of:
0.023450429 = score(doc=3364,freq=2.0), product of:
0.1212218 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.034616705 = queryNorm
0.19345059 = fieldWeight in 3364, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0390625 = fieldNorm(doc=3364)
0.5 = coord(1/2)
- Abstract
- Purpose The purpose of this paper is to examine participation in online social platforms consisting of information exchange, social network interactions, and political deliberation. Despite the proven benefits of online participation, the majority of internet users read social media data but do not directly contribute, a phenomenon called lurking. Design/methodology/approach A survey was administered electronically to 507 participants and consisted of ten sections in a questionnaire to gather data on the relationship between online participation and the following variables: anonymity, social value orientation, motivations, and participation in offline activities, as well as the internet's political influence and personality traits. Findings Findings show that users with high levels of participation also identify themselves, report higher levels of extroversion, openness, and activity outside the internet, the motivations being an intermediary variable in the relationship between the variables value. Originality/value The study shows that participation in online social platforms is not only related to personality traits, but they are impacted by the nature of the motivations that drive them to participate in the particular social platform, as well as by the interest toward the specific topic, or the type or nature of the social group with whom they are communicating.
- Date
- 20. 1.2015 18:30:22
- Type
- a
-
Bar-Ilan, J.: Information hub blogs (2005)
0.02
0.02330686 = product of:
0.04661372 = sum of:
0.04661372 = product of:
0.06992058 = sum of:
0.061784692 = weight(_text_:j in 193) [ClassicSimilarity], result of:
0.061784692 = score(doc=193,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.5617073 = fieldWeight in 193, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.125 = fieldNorm(doc=193)
0.008135883 = weight(_text_:a in 193) [ClassicSimilarity], result of:
0.008135883 = score(doc=193,freq=2.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.20383182 = fieldWeight in 193, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.125 = fieldNorm(doc=193)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Type
- a
-
Zhitomirsky-Geffet, M.; Bar-Ilan, J.: Towards maximal unification of semantically diverse ontologies for controversial domains (2014)
0.02
0.020908467 = product of:
0.041816935 = sum of:
0.041816935 = sum of:
0.015446173 = weight(_text_:j in 1634) [ClassicSimilarity], result of:
0.015446173 = score(doc=1634,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.14042683 = fieldWeight in 1634, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.03125 = fieldNorm(doc=1634)
0.007610422 = weight(_text_:a in 1634) [ClassicSimilarity], result of:
0.007610422 = score(doc=1634,freq=28.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.19066721 = fieldWeight in 1634, product of:
5.2915025 = tf(freq=28.0), with freq of:
28.0 = termFreq=28.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.03125 = fieldNorm(doc=1634)
0.018760342 = weight(_text_:22 in 1634) [ClassicSimilarity], result of:
0.018760342 = score(doc=1634,freq=2.0), product of:
0.1212218 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.034616705 = queryNorm
0.15476047 = fieldWeight in 1634, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.03125 = fieldNorm(doc=1634)
0.5 = coord(1/2)
- Abstract
- Purpose - Ontologies are prone to wide semantic variability due to subjective points of view of their composers. The purpose of this paper is to propose a new approach for maximal unification of diverse ontologies for controversial domains by their relations. Design/methodology/approach - Effective matching or unification of multiple ontologies for a specific domain is crucial for the success of many semantic web applications, such as semantic information retrieval and organization, document tagging, summarization and search. To this end, numerous automatic and semi-automatic techniques were proposed in the past decade that attempt to identify similar entities, mostly classes, in diverse ontologies for similar domains. Apparently, matching individual entities cannot result in full integration of ontologies' semantics without matching their inter-relations with all other-related classes (and instances). However, semantic matching of ontological relations still constitutes a major research challenge. Therefore, in this paper the authors propose a new paradigm for assessment of maximal possible matching and unification of ontological relations. To this end, several unification rules for ontological relations were devised based on ontological reference rules, and lexical and textual entailment. These rules were semi-automatically implemented to extend a given ontology with semantically matching relations from another ontology for a similar domain. Then, the ontologies were unified through these similar pairs of relations. The authors observe that these rules can be also facilitated to reveal the contradictory relations in different ontologies. Findings - To assess the feasibility of the approach two experiments were conducted with different sets of multiple personal ontologies on controversial domains constructed by trained subjects. The results for about 50 distinct ontology pairs demonstrate a good potential of the methodology for increasing inter-ontology agreement. Furthermore, the authors show that the presented methodology can lead to a complete unification of multiple semantically heterogeneous ontologies. Research limitations/implications - This is a conceptual study that presents a new approach for semantic unification of ontologies by a devised set of rules along with the initial experimental evidence of its feasibility and effectiveness. However, this methodology has to be fully automatically implemented and tested on a larger dataset in future research. Practical implications - This result has implication for semantic search, since a richer ontology, comprised of multiple aspects and viewpoints of the domain of knowledge, enhances discoverability and improves search results. Originality/value - To the best of the knowledge, this is the first study to examine and assess the maximal level of semantic relation-based ontology unification.
- Date
- 20. 1.2015 18:30:22
- Type
- a
-
Bar-Ilan, J.; Gutman,T.: How do search engines respond to some non-English queries? (2005)
0.02
0.020393502 = product of:
0.040787004 = sum of:
0.040787004 = product of:
0.061180506 = sum of:
0.054061607 = weight(_text_:j in 4653) [ClassicSimilarity], result of:
0.054061607 = score(doc=4653,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.4914939 = fieldWeight in 4653, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.109375 = fieldNorm(doc=4653)
0.007118898 = weight(_text_:a in 4653) [ClassicSimilarity], result of:
0.007118898 = score(doc=4653,freq=2.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.17835285 = fieldWeight in 4653, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.109375 = fieldNorm(doc=4653)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Type
- a
-
Zhitomirsky-Geffet, M.; Bar-Ilan, J.; Levene, M.: Testing the stability of "wisdom of crowds" judgments of search results over time and their similarity with the search engine rankings (2016)
0.02
0.019793948 = product of:
0.039587896 = sum of:
0.039587896 = sum of:
0.015446173 = weight(_text_:j in 3071) [ClassicSimilarity], result of:
0.015446173 = score(doc=3071,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.14042683 = fieldWeight in 3071, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.03125 = fieldNorm(doc=3071)
0.005381381 = weight(_text_:a in 3071) [ClassicSimilarity], result of:
0.005381381 = score(doc=3071,freq=14.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.13482209 = fieldWeight in 3071, product of:
3.7416575 = tf(freq=14.0), with freq of:
14.0 = termFreq=14.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.03125 = fieldNorm(doc=3071)
0.018760342 = weight(_text_:22 in 3071) [ClassicSimilarity], result of:
0.018760342 = score(doc=3071,freq=2.0), product of:
0.1212218 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.034616705 = queryNorm
0.15476047 = fieldWeight in 3071, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.03125 = fieldNorm(doc=3071)
0.5 = coord(1/2)
- Abstract
- Purpose - One of the under-explored aspects in the process of user information seeking behaviour is influence of time on relevance evaluation. It has been shown in previous studies that individual users might change their assessment of search results over time. It is also known that aggregated judgements of multiple individual users can lead to correct and reliable decisions; this phenomenon is known as the "wisdom of crowds". The purpose of this paper is to examine whether aggregated judgements will be more stable and thus more reliable over time than individual user judgements. Design/methodology/approach - In this study two simple measures are proposed to calculate the aggregated judgements of search results and compare their reliability and stability to individual user judgements. In addition, the aggregated "wisdom of crowds" judgements were used as a means to compare the differences between human assessments of search results and search engine's rankings. A large-scale user study was conducted with 87 participants who evaluated two different queries and four diverse result sets twice, with an interval of two months. Two types of judgements were considered in this study: relevance on a four-point scale, and ranking on a ten-point scale without ties. Findings - It was found that aggregated judgements are much more stable than individual user judgements, yet they are quite different from search engine rankings. Practical implications - The proposed "wisdom of crowds"-based approach provides a reliable reference point for the evaluation of search engines. This is also important for exploring the need of personalisation and adapting search engine's ranking over time to changes in users preferences. Originality/value - This is a first study that applies the notion of "wisdom of crowds" to examine an under-explored in the literature phenomenon of "change in time" in user evaluation of relevance.
- Date
- 20. 1.2015 18:30:22
- Type
- a
-
Lazinger, S.S.; Peritz, B.C.; Bar-Ilan, J.: Using a local area network as an interface to wide area networks in library and information science education (1993)
0.02
0.018322643 = product of:
0.036645286 = sum of:
0.036645286 = product of:
0.05496793 = sum of:
0.04633852 = weight(_text_:j in 7125) [ClassicSimilarity], result of:
0.04633852 = score(doc=7125,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.4212805 = fieldWeight in 7125, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.09375 = fieldNorm(doc=7125)
0.008629408 = weight(_text_:a in 7125) [ClassicSimilarity], result of:
0.008629408 = score(doc=7125,freq=4.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.2161963 = fieldWeight in 7125, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.09375 = fieldNorm(doc=7125)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Type
- a
-
Bar-Ilan, J.; Levene, M.: ¬The hw-rank : an h-index variant for ranking web pages (2015)
0.01
0.014566787 = product of:
0.029133573 = sum of:
0.029133573 = product of:
0.04370036 = sum of:
0.03861543 = weight(_text_:j in 1694) [ClassicSimilarity], result of:
0.03861543 = score(doc=1694,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.35106707 = fieldWeight in 1694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.078125 = fieldNorm(doc=1694)
0.0050849267 = weight(_text_:a in 1694) [ClassicSimilarity], result of:
0.0050849267 = score(doc=1694,freq=2.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.12739488 = fieldWeight in 1694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.078125 = fieldNorm(doc=1694)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Type
- a
-
Bar-Ilan, J.: Methods for measuring search engine performance over time (2002)
0.01
0.013618909 = product of:
0.027237818 = sum of:
0.027237818 = product of:
0.040856726 = sum of:
0.030892346 = weight(_text_:j in 305) [ClassicSimilarity], result of:
0.030892346 = score(doc=305,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.28085366 = fieldWeight in 305, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0625 = fieldNorm(doc=305)
0.009964381 = weight(_text_:a in 305) [ClassicSimilarity], result of:
0.009964381 = score(doc=305,freq=12.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.24964198 = fieldWeight in 305, product of:
3.4641016 = tf(freq=12.0), with freq of:
12.0 = termFreq=12.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=305)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- This study introduces methods for evaluating search engine performance over a time period. Several measures are defined, which as a whole describe search engine functionality over time. The necessary setup for such studies is described, and the use of these measures is illustrated through a specific example. The set of measures introduced here may serve as a guideline for the search engines for testing and improving their functionality. We recommend setting up a standard suite of measures for evaluating search engine performance.
- Type
- a
-
Bar-Ilan, J.; Peritz, B.C.: Evolution, continuity, and disappearance of documents on a specific topic an the Web : a longitudinal study of "informetrics" (2004)
0.01
0.011663325 = product of:
0.02332665 = sum of:
0.02332665 = product of:
0.034989975 = sum of:
0.027030803 = weight(_text_:j in 2886) [ClassicSimilarity], result of:
0.027030803 = score(doc=2886,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.24574696 = fieldWeight in 2886, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0546875 = fieldNorm(doc=2886)
0.00795917 = weight(_text_:a in 2886) [ClassicSimilarity], result of:
0.00795917 = score(doc=2886,freq=10.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.19940455 = fieldWeight in 2886, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=2886)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The present paper analyzes the changes that occurred to a set of Web pages related to "informetrics" over a period of 5 years between June 1998 and June 2003. Four times during this time span, in 1998,1999, 2002, and 2003, we monitored previously located pages and searched for new ones related to the topic. Thus, we were able to study the growth of the topic, white analyzing the rates of change and disappearance. The results indicate that modification, disappearance, and resurfacing cannot be ignored when studying the structure and development of the Web.
- Type
- a
-
Lazinger, S.S.; Bar-Ilan, J.; Peritz, B.C.: Internet use by faculty members in various disciplines : a comparative case study (1997)
0.01
0.0113832345 = product of:
0.022766469 = sum of:
0.022766469 = product of:
0.034149703 = sum of:
0.027030803 = weight(_text_:j in 390) [ClassicSimilarity], result of:
0.027030803 = score(doc=390,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.24574696 = fieldWeight in 390, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0546875 = fieldNorm(doc=390)
0.007118898 = weight(_text_:a in 390) [ClassicSimilarity], result of:
0.007118898 = score(doc=390,freq=8.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.17835285 = fieldWeight in 390, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=390)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- Examines and compares the use of the Internet among various sectors of the faculty at the Hebrew University of Jerusalem, Israel, in order to verify the influence of a number of parameters on this use. Questionnaires were sent to faculty members in all departments and professional schools of the Hebrew University of Jerusalem, a total population of 918 for both the pilot project and the main study. Results indicated that Internet use is consistently higher among faculty members in the sciences and agriculture than among those in the humanities or social sciences. Makes suggestions for training the level of Internet use among the various disciplines of the faculty
- Type
- a
-
Bar-Ilan, J.: Evaluating the stability of the search tools Hotbot and Snap : a case study (2000)
0.01
0.011065317 = product of:
0.022130635 = sum of:
0.022130635 = product of:
0.03319595 = sum of:
0.027030803 = weight(_text_:j in 1180) [ClassicSimilarity], result of:
0.027030803 = score(doc=1180,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.24574696 = fieldWeight in 1180, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0546875 = fieldNorm(doc=1180)
0.006165147 = weight(_text_:a in 1180) [ClassicSimilarity], result of:
0.006165147 = score(doc=1180,freq=6.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.1544581 = fieldWeight in 1180, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=1180)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- Discusses the results of a case study in which 20 random queries were presented for ten consecutive days to Hotbot and Snap, two search tools that draw their results from the database of Inktomi. The results show huge daily fluctuations in the number of hits retrieved by Hotbot, and high stability in the hits displayed by Snap. These findings are to alert users of Hotbot of its instability as of October 1999, and they raise questions about the reliability of previous studies estimating the size of Hotbot based on its overlap with other search engines.
- Type
- a
-
Bar-Ilan, J.: On the overlap, the precision and estimated recall of search engines : a case study of the query 'Erdös' (1998)
0.01
0.011065317 = product of:
0.022130635 = sum of:
0.022130635 = product of:
0.03319595 = sum of:
0.027030803 = weight(_text_:j in 3753) [ClassicSimilarity], result of:
0.027030803 = score(doc=3753,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.24574696 = fieldWeight in 3753, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0546875 = fieldNorm(doc=3753)
0.006165147 = weight(_text_:a in 3753) [ClassicSimilarity], result of:
0.006165147 = score(doc=3753,freq=6.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.1544581 = fieldWeight in 3753, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=3753)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- Investigates the retrieval capabilities of 6 Internet search engines on a simple query. Existing work on search engine evaluation considers only the first 10 or 20 results returned by the search engine. In this work, all documents that the search engine pointed at were retrieved and thoroughly examined. Thus the precision of the whole retrieval process could be calculated, the overlap between the results of the engines studied, and an estimate on the recall of the searches given. The precision of the engines is high, recall is very low and the overlap is minimal
- Type
- a
-
Bar-Ilan, J.: What do we know about links and linking? : a framework for studying links in academic environments (2005)
0.01
0.010413777 = product of:
0.020827554 = sum of:
0.020827554 = product of:
0.031241331 = sum of:
0.02316926 = weight(_text_:j in 1058) [ClassicSimilarity], result of:
0.02316926 = score(doc=1058,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 1058, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=1058)
0.008072072 = weight(_text_:a in 1058) [ClassicSimilarity], result of:
0.008072072 = score(doc=1058,freq=14.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.20223314 = fieldWeight in 1058, product of:
3.7416575 = tf(freq=14.0), with freq of:
14.0 = termFreq=14.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=1058)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The Web is an enormous set of documents connected through hypertext links created by authors of Web pages. These links have been studied quantitatively, but little has been done so far in order to understand why these links are created. As a first step towards a better understanding, we propose a classification of link types in academic environments on the Web. The classification is multi-faceted and involves different aspects of the source and the target page, the link area and the relationship between the source and the target. Such classification provides an insight into the diverse uses of hypertext links on the Web, and has implications for browsing and ranking in IR systems by differentiating between different types of links. As a case study we classified a sample of links between sites of Israeli academic institutions.
- Type
- a
-
Bar-Ilan, J.: ¬The use of Web search engines in information science research (2003)
0.01
0.009997136 = product of:
0.019994272 = sum of:
0.019994272 = product of:
0.029991407 = sum of:
0.02316926 = weight(_text_:j in 4271) [ClassicSimilarity], result of:
0.02316926 = score(doc=4271,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 4271, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=4271)
0.006822146 = weight(_text_:a in 4271) [ClassicSimilarity], result of:
0.006822146 = score(doc=4271,freq=10.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.1709182 = fieldWeight in 4271, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=4271)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The World Wide Web was created in 1989, but it has already become a major information channel and source, influencing our everyday lives, commercial transactions, and scientific communication, to mention just a few areas. The seventeenth-century philosopher Descartes proclaimed, "I think, therefore I am" (cogito, ergo sum). Today the Web is such an integral part of our lives that we could rephrase Descartes' statement as "I have a Web presence, therefore I am." Because many people, companies, and organizations take this notion seriously, in addition to more substantial reasons for publishing information an the Web, the number of Web pages is in the billions and growing constantly. However, it is not sufficient to have a Web presence; tools that enable users to locate Web pages are needed as well. The major tools for discovering and locating information an the Web are search engines. This review discusses the use of Web search engines in information science research. Before going into detail, we should define the terms "information science," "Web search engine," and "use" in the context of this review.
- Type
- a
-
Bar-Ilan, J.: ¬The Web as an information source on informetrics? : A content analysis (2000)
0.01
0.009757059 = product of:
0.019514117 = sum of:
0.019514117 = product of:
0.029271174 = sum of:
0.02316926 = weight(_text_:j in 4587) [ClassicSimilarity], result of:
0.02316926 = score(doc=4587,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 4587, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=4587)
0.006101913 = weight(_text_:a in 4587) [ClassicSimilarity], result of:
0.006101913 = score(doc=4587,freq=8.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.15287387 = fieldWeight in 4587, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=4587)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- This article addresses the question of whether the Web can serve as an information source for research. Specifically, it analyzes by way of content analysis the Web pages retrieved by the major search engines on a particular date (June 7, 1998), as a result of the query 'informetrics OR informetric'. In 807 out of the 942 retrieved pages, the search terms were mentioned in the context of information science. Over 70% of the pages contained only indirect information on the topic, in the form of hypertext links and bibliographical references without annotation. The bibliographical references extracted from the Web pages were analyzed, and lists of most productive authors, most cited authors, works, and sources were compiled. The list of reference obtained from the Web was also compared to data retrieved from commercial databases. For most cases, the list of references extracted from the Web outperformed the commercial, bibliographic databases. The results of these comparisons indicate that valuable, freely available data is hidden in the Web waiting to be extracted from the millions of Web pages
- Type
- a
-
Bar-Ilan, J.; Azoulay, R.: Map of nonprofit organization websites in Israel (2012)
0.01
0.009757059 = product of:
0.019514117 = sum of:
0.019514117 = product of:
0.029271174 = sum of:
0.02316926 = weight(_text_:j in 253) [ClassicSimilarity], result of:
0.02316926 = score(doc=253,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 253, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=253)
0.006101913 = weight(_text_:a in 253) [ClassicSimilarity], result of:
0.006101913 = score(doc=253,freq=8.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.15287387 = fieldWeight in 253, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=253)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- In this study, we consider the structure and linking strategy of Hebrew websites of several nonprofit organizations. Because nonprofit organizations differ from commercial, educational, or governmental sectors, it is important to understand the ways they utilize the web. To the best of our knowledge, the linking structure of nonprofit organizations has not been previously studied. We surveyed websites of 54 nonprofit organizations in Israel; most of these sites have at least 100 volunteers. We compared their orientation and contents and we built their linking map. We divided the organizations into four main groups: economic aid and citizen rights organizations, health aid organizations, organizations supporting families and individuals with special needs, and organizations for women and children. We found that the number of links inside the special needs group is much higher than in the other groups. We tried to explain this behavior by considering the data obtained from the site-linking graph. The value of our results is in defining and testing a method to investigate a group of nonprofit organizations, using a case study of Israeli organizations.
- Type
- a
-
Shema, H.; Bar-Ilan, J.; Thelwall, M.: Do blog citations correlate with a higher number of future citations? : Research blogs as a potential source for alternative metrics (2014)
0.01
0.009757059 = product of:
0.019514117 = sum of:
0.019514117 = product of:
0.029271174 = sum of:
0.02316926 = weight(_text_:j in 1258) [ClassicSimilarity], result of:
0.02316926 = score(doc=1258,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 1258, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=1258)
0.006101913 = weight(_text_:a in 1258) [ClassicSimilarity], result of:
0.006101913 = score(doc=1258,freq=8.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.15287387 = fieldWeight in 1258, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=1258)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- Journal-based citations are an important source of data for impact indices. However, the impact of journal articles extends beyond formal scholarly discourse. Measuring online scholarly impact calls for new indices, complementary to the older ones. This article examines a possible alternative metric source, blog posts aggregated at ResearchBlogging.org, which discuss peer-reviewed articles and provide full bibliographic references. Articles reviewed in these blogs therefore receive "blog citations." We hypothesized that articles receiving blog citations close to their publication time receive more journal citations later than the articles in the same journal published in the same year that did not receive such blog citations. Statistically significant evidence for articles published in 2009 and 2010 support this hypothesis for seven of 12 journals (58%) in 2009 and 13 of 19 journals (68%) in 2010. We suggest, based on these results, that blog citations can be used as an alternative metric source.
- Type
- a
-
Bar-Ilan, J.; Peritz, B.C.: Informetric theories and methods for exploring the Internet : an analytical survey of recent research literature (2002)
0.01
0.009484557 = product of:
0.018969115 = sum of:
0.018969115 = product of:
0.028453672 = sum of:
0.02316926 = weight(_text_:j in 813) [ClassicSimilarity], result of:
0.02316926 = score(doc=813,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 813, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=813)
0.0052844114 = weight(_text_:a in 813) [ClassicSimilarity], result of:
0.0052844114 = score(doc=813,freq=6.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.13239266 = fieldWeight in 813, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=813)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The Internet, and more specifically the World Wide Web, is quickly becoming one of our main information sources. Systematic evaluation and analysis can help us understand how this medium works, grows, and changes, and how it influences our lives and research. New approaches in informetrics can provide an appropriate means towards achieving the above goals, and towards establishing a sound theory. This paper presents a selective review of research based on the Internet, using bibliometric and informetric methods and tools. Some of these studies clearly show the applicability of bibliometric laws to the Internet, while others establish new definitions and methods based on the respective definitions for printed sources. Both informetrics and Internet research can gain from these additional methods.
- Type
- a
-
Bar-Ilan, J.: Informetrics (2009)
0.01
0.009161321 = product of:
0.018322643 = sum of:
0.018322643 = product of:
0.027483964 = sum of:
0.02316926 = weight(_text_:j in 3822) [ClassicSimilarity], result of:
0.02316926 = score(doc=3822,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.21064025 = fieldWeight in 3822, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.046875 = fieldNorm(doc=3822)
0.004314704 = weight(_text_:a in 3822) [ClassicSimilarity], result of:
0.004314704 = score(doc=3822,freq=4.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.10809815 = fieldWeight in 3822, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=3822)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- Informetrics is a subfield of information science and it encompasses bibliometrics, scientometrics, cybermetrics, and webometrics. This encyclopedia entry provides an overview of informetrics and its subfields. In general, informetrics deals with quantitative aspects of information: its production, dissemination, evaluation, and use. Bibliometrics and scientometrics study scientific literature: papers, journals, patents, and citations; while in webometric studies the sources studied are Web pages and Web sites, and citations are replaced by hypertext links. The entry introduces major topics in informetrics: citation analysis and citation related studies, the journal impact factor, the recently defined h-index, citation databases, co-citation analysis, open access publications and its implications, informetric laws, techniques for mapping and visualization of informetric phenomena, the emerging subfields of webometrics, cybermetrics and link analysis, and research evaluation.
- Type
- a
-
Bar-Ilan, J.; Peritz, B.C.: ¬A method for measuring the evolution of a topic on the Web : the case of "informetrics" (2009)
0.01
0.008978369 = product of:
0.017956737 = sum of:
0.017956737 = product of:
0.026935106 = sum of:
0.019307716 = weight(_text_:j in 3089) [ClassicSimilarity], result of:
0.019307716 = score(doc=3089,freq=2.0), product of:
0.109994456 = queryWeight, product of:
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.034616705 = queryNorm
0.17553353 = fieldWeight in 3089, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1774964 = idf(docFreq=5010, maxDocs=44218)
0.0390625 = fieldNorm(doc=3089)
0.007627391 = weight(_text_:a in 3089) [ClassicSimilarity], result of:
0.007627391 = score(doc=3089,freq=18.0), product of:
0.039914686 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.034616705 = queryNorm
0.19109234 = fieldWeight in 3089, product of:
4.2426405 = tf(freq=18.0), with freq of:
18.0 = termFreq=18.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0390625 = fieldNorm(doc=3089)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The universe of information has been enriched by the creation of the World Wide Web, which has become an indispensible source for research. Since this source is growing at an enormous speed, an in-depth look of its performance to create a method for its evaluation has become necessary; however, growth is not the only process that influences the evolution of the Web. During their lifetime, Web pages may change their content and links to/from other Web pages, be duplicated or moved to a different URL, be removed from the Web either temporarily or permanently, and be temporarily inaccessible due to server and/or communication failures. To obtain a better understanding of these processes, we developed a method for tracking topics on the Web for long periods of time, without the need to employ a crawler and relying only on publicly available resources. The multiple data-collection methods used allow us to discover new pages related to the topic, to identify changes to existing pages, and to detect previously existing pages that have been removed or whose content is not relevant anymore to the specified topic. The method is demonstrated through monitoring Web pages that contain the term informetrics for a period of 8 years. The data-collection method also allowed us to analyze the dynamic changes in search engine coverage, illustrated here on Google - the search engine used for the longest period of time for data collection in this project.
- Type
- a
