-
Lewandowski, D.; Sünkler, S.: What does Google recommend when you want to compare insurance offerings? (2019)
0.02
0.021044843 = product of:
0.105224214 = sum of:
0.105224214 = sum of:
0.07717067 = weight(_text_:german in 5288) [ClassicSimilarity], result of:
0.07717067 = score(doc=5288,freq=2.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.3208502 = fieldWeight in 5288, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.0390625 = fieldNorm(doc=5288)
0.028053544 = weight(_text_:22 in 5288) [ClassicSimilarity], result of:
0.028053544 = score(doc=5288,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.19345059 = fieldWeight in 5288, 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=5288)
0.2 = coord(1/5)
- Date
- 20. 1.2015 18:30:22
- Footnote
- Beitrag in einem Special Issue: Information Science in the German-speaking Countries
-
Lewandowski, D.; Haustein, S.: What does the German-language information science community cite? (2015)
0.02
0.015434134 = product of:
0.07717067 = sum of:
0.07717067 = product of:
0.15434134 = sum of:
0.15434134 = weight(_text_:german in 2987) [ClassicSimilarity], result of:
0.15434134 = score(doc=2987,freq=2.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.6417004 = fieldWeight in 2987, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.078125 = fieldNorm(doc=2987)
0.5 = coord(1/2)
0.2 = coord(1/5)
-
Lewandowski, D.: ¬The retrieval effectiveness of search engines on navigational queries (2011)
0.01
0.013366356 = product of:
0.066831775 = sum of:
0.066831775 = product of:
0.13366355 = sum of:
0.13366355 = weight(_text_:german in 4537) [ClassicSimilarity], result of:
0.13366355 = score(doc=4537,freq=6.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.5557289 = fieldWeight in 4537, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.0390625 = fieldNorm(doc=4537)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Abstract
- Purpose - The purpose of this paper is to test major web search engines on their performance on navigational queries, i.e. searches for homepages. Design/methodology/approach - In total, 100 user queries are posed to six search engines (Google, Yahoo!, MSN, Ask, Seekport, and Exalead). Users described the desired pages, and the results position of these was recorded. Measured success and mean reciprocal rank are calculated. Findings - The performance of the major search engines Google, Yahoo!, and MSN was found to be the best, with around 90 per cent of queries answered correctly. Ask and Exalead performed worse but received good scores as well. Research limitations/implications - All queries were in German, and the German-language interfaces of the search engines were used. Therefore, the results are only valid for German queries. Practical implications - When designing a search engine to compete with the major search engines, care should be taken on the performance on navigational queries. Users can be influenced easily in their quality ratings of search engines based on this performance. Originality/value - This study systematically compares the major search engines on navigational queries and compares the findings with studies on the retrieval effectiveness of the engines on informational queries.
-
Lewandowski, D.; Kerkmann, F.; Rümmele, S.; Sünkler, S.: ¬An empirical investigation on search engine ad disclosure (2018)
0.01
0.010803895 = product of:
0.054019473 = sum of:
0.054019473 = product of:
0.10803895 = sum of:
0.10803895 = weight(_text_:german in 4115) [ClassicSimilarity], result of:
0.10803895 = score(doc=4115,freq=2.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.4491903 = fieldWeight in 4115, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.0546875 = fieldNorm(doc=4115)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Abstract
- This representative study of German search engine users (N?=?1,000) focuses on the ability of users to distinguish between organic results and advertisements on Google results pages. We combine questions about Google's business with task-based studies in which users were asked to distinguish between ads and organic results in screenshots of results pages. We find that only a small percentage of users can reliably distinguish between ads and organic results, and that user knowledge of Google's business model is very limited. We conclude that ads are insufficiently labelled as such, and that many users may click on ads assuming that they are selecting organic results.
-
Lewandowski, D.: Evaluating the retrieval effectiveness of web search engines using a representative query sample (2015)
0.01
0.009260482 = product of:
0.046302408 = sum of:
0.046302408 = product of:
0.092604816 = sum of:
0.092604816 = weight(_text_:german in 2157) [ClassicSimilarity], result of:
0.092604816 = score(doc=2157,freq=2.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.38502026 = fieldWeight in 2157, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.046875 = fieldNorm(doc=2157)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Abstract
- Search engine retrieval effectiveness studies are usually small scale, using only limited query samples. Furthermore, queries are selected by the researchers. We address these issues by taking a random representative sample of 1,000 informational and 1,000 navigational queries from a major German search engine and comparing Google's and Bing's results based on this sample. Jurors were found through crowdsourcing, and data were collected using specialized software, the Relevance Assessment Tool (RAT). We found that although Google outperforms Bing in both query types, the difference in the performance for informational queries was rather low. However, for navigational queries, Google found the correct answer in 95.3% of cases, whereas Bing only found the correct answer 76.6% of the time. We conclude that search engine performance on navigational queries is of great importance, because users in this case can clearly identify queries that have returned correct results. So, performance on this query type may contribute to explaining user satisfaction with search engines.
-
Lewandowski, D.; Sünkler, S.; Kerkmann, F.: Are ads on Google search engine results pages labeled clearly enough? : the influence of knowledge on search ads on users' selection behaviour (2017)
0.01
0.007717067 = product of:
0.038585335 = sum of:
0.038585335 = product of:
0.07717067 = sum of:
0.07717067 = weight(_text_:german in 3567) [ClassicSimilarity], result of:
0.07717067 = score(doc=3567,freq=2.0), product of:
0.24051933 = queryWeight, product of:
5.808009 = idf(docFreq=360, maxDocs=44218)
0.041411664 = queryNorm
0.3208502 = fieldWeight in 3567, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.808009 = idf(docFreq=360, maxDocs=44218)
0.0390625 = fieldNorm(doc=3567)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Abstract
- In an online experiment using a representative sample of the German online population (n = 1.000), we compare users' selection behaviour on two versions of the same Google search engine results page (SERP), one showing advertisements and organic results, the other showing organic results only. Selection behaviour is analyzed in relation to users' knowledge on Google's business model, on SERP design, and on these users' actual performance in marking advertisements on SERPs correctly. We find that users who were not able to mark ads correctly selected ads significantly more often. This leads to the conclusion that ads need to be labeled more clearly, and that there is a need for more information literacy in search engine users.
-
Lewandowski, D.: Alles nur noch Google? : Entwicklungen im Bereich der WWW-Suchmaschinen (2002)
0.00
0.0044885674 = product of:
0.022442836 = sum of:
0.022442836 = product of:
0.044885673 = sum of:
0.044885673 = weight(_text_:22 in 997) [ClassicSimilarity], result of:
0.044885673 = score(doc=997,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.30952093 = fieldWeight in 997, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=997)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Date
- 29. 9.2002 18:49:22
-
Lewandowski, D.: Abfragesprachen und erweiterte Funktionen von WWW-Suchmaschinen (2004)
0.00
0.0044885674 = product of:
0.022442836 = sum of:
0.022442836 = product of:
0.044885673 = sum of:
0.044885673 = weight(_text_:22 in 2314) [ClassicSimilarity], result of:
0.044885673 = score(doc=2314,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.30952093 = fieldWeight in 2314, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=2314)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Date
- 28.11.2004 13:11:22
-
Lewandowski, D.: Query understanding (2011)
0.00
0.0044885674 = product of:
0.022442836 = sum of:
0.022442836 = product of:
0.044885673 = sum of:
0.044885673 = weight(_text_:22 in 344) [ClassicSimilarity], result of:
0.044885673 = score(doc=344,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.30952093 = fieldWeight in 344, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=344)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Date
- 18. 9.2018 18:22:18
-
Lewandowski, D.: ¬Die Macht der Suchmaschinen und ihr Einfluss auf unsere Entscheidungen (2014)
0.00
0.0033664254 = product of:
0.016832126 = sum of:
0.016832126 = product of:
0.033664253 = sum of:
0.033664253 = weight(_text_:22 in 1491) [ClassicSimilarity], result of:
0.033664253 = score(doc=1491,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.23214069 = fieldWeight in 1491, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=1491)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Date
- 22. 9.2014 18:54:11
-
Lewandowski, D.; Spree, U.: Ranking of Wikipedia articles in search engines revisited : fair ranking for reasonable quality? (2011)
0.00
0.0028053545 = product of:
0.014026772 = sum of:
0.014026772 = product of:
0.028053544 = sum of:
0.028053544 = weight(_text_:22 in 444) [ClassicSimilarity], result of:
0.028053544 = score(doc=444,freq=2.0), product of:
0.1450166 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.041411664 = queryNorm
0.19345059 = fieldWeight in 444, 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=444)
0.5 = coord(1/2)
0.2 = coord(1/5)
- Date
- 30. 9.2012 19:27:22
