-
Spink, A.; Saracevic, T.: Where do the search terms come from? (1992)
0.02
0.01899322 = product of:
0.09496609 = sum of:
0.09496609 = weight(_text_:relation in 4032) [ClassicSimilarity], result of:
0.09496609 = score(doc=4032,freq=2.0), product of:
0.20534351 = queryWeight, product of:
5.232299 = idf(docFreq=641, maxDocs=44218)
0.03924537 = queryNorm
0.46247426 = fieldWeight in 4032, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.232299 = idf(docFreq=641, maxDocs=44218)
0.0625 = fieldNorm(doc=4032)
0.2 = coord(1/5)
- Abstract
- Presents selected results from a large study which observed under real-life conditions the interaction between users, intermediaries and computers before and during online searching. Concentrates on the sources of search terms and the relation between given search terms and retrieval of relevant and nonrelevant items as answers. Users provided the largest proportion of search terms (61%), followed by the thesuaurs (19%), relevance feedback (11%), and intermediary (9%). Only 4% of search terms resulted in retrieval of relevant items only; 60% retrieved relevant and nonrelevant items; 25% retrieved nonrelevant items only; and 11% retrieved nothing.
-
Spink, A.; Saracevic, T.: Sources and use of search terms in online searching (1992)
0.02
0.016619066 = product of:
0.08309533 = sum of:
0.08309533 = weight(_text_:relation in 4523) [ClassicSimilarity], result of:
0.08309533 = score(doc=4523,freq=2.0), product of:
0.20534351 = queryWeight, product of:
5.232299 = idf(docFreq=641, maxDocs=44218)
0.03924537 = queryNorm
0.40466496 = fieldWeight in 4523, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.232299 = idf(docFreq=641, maxDocs=44218)
0.0546875 = fieldNorm(doc=4523)
0.2 = coord(1/5)
- Abstract
- Reports selected results from a larger study whose objectives are to observe, under real life conditions, the nature and patterns of interaction between users, intermediaries, and computer sysrtems in the context of online information searching and retrieval. Reports various analyses on the relation of search term sources and the retrieval of items judges as to their relevance. While the users generated the largest proportion of search terms (61%) which were responsible for 68% of retrieved items judges relevant, other sources in the interaction process played an important role
-
Saracevic, T.; Kantor, P.B.: Studying the value of library and information services : Part I: Establishing a theoretical framework (1997)
0.01
0.014244914 = product of:
0.07122457 = sum of:
0.07122457 = weight(_text_:relation in 352) [ClassicSimilarity], result of:
0.07122457 = score(doc=352,freq=2.0), product of:
0.20534351 = queryWeight, product of:
5.232299 = idf(docFreq=641, maxDocs=44218)
0.03924537 = queryNorm
0.3468557 = fieldWeight in 352, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.232299 = idf(docFreq=641, maxDocs=44218)
0.046875 = fieldNorm(doc=352)
0.2 = coord(1/5)
- Abstract
- Discusses underlying concepts related to value that must be clarified in order to proceed with any pragmatic study of value, and establishes a theory of use-oriented value of information and information services. Examines the notion of value in philosophy and economics and in relation to library and information services as well as the connection between value and relevance. Develops 2 models: one related to use of information and the other to use of library and information services. They are a theoretical framework for pragmatic study of value and a guide for the development of a Derived Taxonomy of Value in Using Library and Information Services
-
Kantor, P.B.; Saracevic, T.: Quantitative study of the value of research libraries : a foundation for the evaluation of digital libraries (1999)
0.01
0.011870761 = product of:
0.059353806 = sum of:
0.059353806 = weight(_text_:relation in 6711) [ClassicSimilarity], result of:
0.059353806 = score(doc=6711,freq=2.0), product of:
0.20534351 = queryWeight, product of:
5.232299 = idf(docFreq=641, maxDocs=44218)
0.03924537 = queryNorm
0.2890464 = fieldWeight in 6711, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.232299 = idf(docFreq=641, maxDocs=44218)
0.0390625 = fieldNorm(doc=6711)
0.2 = coord(1/5)
- Abstract
- In anticipation of the explosive growth of digital libraries, a complex study was undertaken seeking to evaluate 21 diverse services at 5 major academic research libraries. This work stands as a model for evaluation of digital libraries, through its focus on both the costs of operations and the impacts of the services that those operations provide. The data have been analyzed using both statistical methods and methods of Data Envelopment Analysis. The results of the study, which are presented in detail, serve to demonstrate that a cross-functional approach to library services is feasible. They also highlight a new measure of impact, which is a weighted logarithmic combination of the amount of time that users spend interacting with the service, combined with a Likert-scale indication of the value of that service in relation to the time expended. The measure derived, incorporating simple information obtainable from the user, together with information which is readily available in server/client logs, provides an excellent foundation for transferring these measurement principles to the Digital Library environment
-
Saracevic, T.: Information retrieval (1985)
0.01
0.0050077736 = product of:
0.025038868 = sum of:
0.025038868 = product of:
0.075116605 = sum of:
0.075116605 = weight(_text_:29 in 3302) [ClassicSimilarity], result of:
0.075116605 = score(doc=3302,freq=2.0), product of:
0.13805294 = queryWeight, product of:
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.03924537 = queryNorm
0.5441145 = fieldWeight in 3302, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.109375 = fieldNorm(doc=3302)
0.33333334 = coord(1/3)
0.2 = coord(1/5)
- Pages
- Chpt.4, S.1-29
-
Saracevic, T.: On a method for studying the structure and nature of requests in information retrieval (1983)
0.00
0.0035448044 = product of:
0.017724022 = sum of:
0.017724022 = product of:
0.053172063 = sum of:
0.053172063 = weight(_text_:22 in 2417) [ClassicSimilarity], result of:
0.053172063 = score(doc=2417,freq=2.0), product of:
0.13743061 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.03924537 = queryNorm
0.38690117 = fieldWeight in 2417, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.078125 = fieldNorm(doc=2417)
0.33333334 = coord(1/3)
0.2 = coord(1/5)
- Pages
- S.22-25
-
Saracevic, T.: Ciencia da informacao, origem, evolucao e relacoes (1996)
0.00
0.0021461889 = product of:
0.010730944 = sum of:
0.010730944 = product of:
0.03219283 = sum of:
0.03219283 = weight(_text_:29 in 811) [ClassicSimilarity], result of:
0.03219283 = score(doc=811,freq=2.0), product of:
0.13805294 = queryWeight, product of:
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.03924537 = queryNorm
0.23319192 = fieldWeight in 811, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.046875 = fieldNorm(doc=811)
0.33333334 = coord(1/3)
0.2 = coord(1/5)
- Date
- 29. 1.1996 18:23:13
