-
Dresel, R.; Hörnig, D.; Kaluza, H.; Peter, A.; Roßmann, A.; Sieber, W.: Evaluation deutscher Web-Suchwerkzeuge : Ein vergleichender Retrievaltest (2001)
0.04
0.038611498 = product of:
0.077222995 = sum of:
0.077222995 = sum of:
0.0207044 = weight(_text_:d in 261) [ClassicSimilarity], result of:
0.0207044 = score(doc=261,freq=4.0), product of:
0.0871823 = queryWeight, product of:
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.045888513 = queryNorm
0.237484 = fieldWeight in 261, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.0625 = fieldNorm(doc=261)
0.0067805187 = weight(_text_:s in 261) [ClassicSimilarity], result of:
0.0067805187 = score(doc=261,freq=4.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.1359047 = fieldWeight in 261, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=261)
0.04973808 = weight(_text_:22 in 261) [ClassicSimilarity], result of:
0.04973808 = score(doc=261,freq=2.0), product of:
0.16069375 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045888513 = queryNorm
0.30952093 = fieldWeight in 261, 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=261)
0.5 = coord(1/2)
- Abstract
- Die deutschen Suchmaschinen, Abacho, Acoon, Fireball und Lycos sowie die Web-Kataloge Web.de und Yahoo! werden einem Qualitätstest nach relativem Recall, Precision und Availability unterzogen. Die Methoden der Retrievaltests werden vorgestellt. Im Durchschnitt werden bei einem Cut-Off-Wert von 25 ein Recall von rund 22%, eine Precision von knapp 19% und eine Verfügbarkeit von 24% erreicht
- Footnote
- Vgl. auch den Bericht in: nfd 53(2002) H.2, S.71
- Language
- d
- Source
- nfd Information - Wissenschaft und Praxis. 52(2001) H.7, S.381-392
-
Griesbaum, J.; Rittberger, M.; Bekavac, B.: Deutsche Suchmaschinen im Vergleich : AltaVista.de, Fireball.de, Google.de und Lycos.de (2002)
0.01
0.008097822 = product of:
0.016195644 = sum of:
0.016195644 = product of:
0.024293464 = sum of:
0.018300276 = weight(_text_:d in 1159) [ClassicSimilarity], result of:
0.018300276 = score(doc=1159,freq=2.0), product of:
0.0871823 = queryWeight, product of:
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.045888513 = queryNorm
0.20990817 = fieldWeight in 1159, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.078125 = fieldNorm(doc=1159)
0.0059931884 = weight(_text_:s in 1159) [ClassicSimilarity], result of:
0.0059931884 = score(doc=1159,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.120123915 = fieldWeight in 1159, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.078125 = fieldNorm(doc=1159)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Language
- d
- Pages
- S.201-223
-
Grasso, L.L.; Wahlig, H.: Google und seine Suchparameter : Eine Top 20-Precision Analyse anhand repräsentativ ausgewählter Anfragen (2005)
0.01
0.0064782575 = product of:
0.012956515 = sum of:
0.012956515 = product of:
0.019434772 = sum of:
0.014640221 = weight(_text_:d in 3275) [ClassicSimilarity], result of:
0.014640221 = score(doc=3275,freq=2.0), product of:
0.0871823 = queryWeight, product of:
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.045888513 = queryNorm
0.16792654 = fieldWeight in 3275, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.0625 = fieldNorm(doc=3275)
0.0047945506 = weight(_text_:s in 3275) [ClassicSimilarity], result of:
0.0047945506 = score(doc=3275,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.09609913 = fieldWeight in 3275, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=3275)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Language
- d
- Source
- Information - Wissenschaft und Praxis. 56(2005) H.2, S.77-86
-
Günther, M.: Vermitteln Suchmaschinen vollständige Bilder aktueller Themen? : Untersuchung der Gewichtung inhaltlicher Aspekte von Suchmaschinenergebnissen in Deutschland und den USA (2016)
0.01
0.0053122817 = product of:
0.010624563 = sum of:
0.010624563 = product of:
0.015936844 = sum of:
0.01294025 = weight(_text_:d in 3068) [ClassicSimilarity], result of:
0.01294025 = score(doc=3068,freq=4.0), product of:
0.0871823 = queryWeight, product of:
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.045888513 = queryNorm
0.1484275 = fieldWeight in 3068, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.0390625 = fieldNorm(doc=3068)
0.0029965942 = weight(_text_:s in 3068) [ClassicSimilarity], result of:
0.0029965942 = score(doc=3068,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 3068, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=3068)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Language
- d
- Location
- D
- Source
- Young information scientists. 1(2016), S.13-29
-
Schaer, P.; Mayr, P.; Sünkler, S.; Lewandowski, D.: How relevant is the long tail? : a relevance assessment study on million short (2016)
0.00
0.004048911 = product of:
0.008097822 = sum of:
0.008097822 = product of:
0.012146732 = sum of:
0.009150138 = weight(_text_:d in 3144) [ClassicSimilarity], result of:
0.009150138 = score(doc=3144,freq=2.0), product of:
0.0871823 = queryWeight, product of:
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.045888513 = queryNorm
0.104954086 = fieldWeight in 3144, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.899872 = idf(docFreq=17979, maxDocs=44218)
0.0390625 = fieldNorm(doc=3144)
0.0029965942 = weight(_text_:s in 3144) [ClassicSimilarity], result of:
0.0029965942 = score(doc=3144,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 3144, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=3144)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
-
Agata, T.: ¬A measure for evaluating search engines on the World Wide Web : retrieval test with ESL (Expected Search Length) (1997)
0.00
0.0011986376 = product of:
0.0023972753 = sum of:
0.0023972753 = product of:
0.0071918257 = sum of:
0.0071918257 = weight(_text_:s in 3892) [ClassicSimilarity], result of:
0.0071918257 = score(doc=3892,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.14414869 = fieldWeight in 3892, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.09375 = fieldNorm(doc=3892)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Library and information science. 1997, no.37, S.1-11
-
Landoni, M.; Bell, S.: Information retrieval techniques for evaluating search engines : a critical overview (2000)
0.00
8.475649E-4 = product of:
0.0016951298 = sum of:
0.0016951298 = product of:
0.005085389 = sum of:
0.005085389 = weight(_text_:s in 716) [ClassicSimilarity], result of:
0.005085389 = score(doc=716,freq=4.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.101928525 = fieldWeight in 716, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=716)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Aslib proceedings. 52(2000) no.3, S.124-129
-
Clarke, S.J.; Willett, P.: Estimating the recall performance of Web search engines (1997)
0.00
7.9909177E-4 = product of:
0.0015981835 = sum of:
0.0015981835 = product of:
0.0047945506 = sum of:
0.0047945506 = weight(_text_:s in 760) [ClassicSimilarity], result of:
0.0047945506 = score(doc=760,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.09609913 = fieldWeight in 760, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=760)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Aslib proceedings. 49(1997) no.7, S.184-189
-
Bar-Ilan, J.: Methods for measuring search engine performance over time (2002)
0.00
7.9909177E-4 = product of:
0.0015981835 = sum of:
0.0015981835 = product of:
0.0047945506 = sum of:
0.0047945506 = weight(_text_:s in 305) [ClassicSimilarity], result of:
0.0047945506 = score(doc=305,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.09609913 = fieldWeight in 305, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=305)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and technology. 53(2002) no.4, S.308-319
-
Serrano Cobos, J.; Quintero Orta, A.: Design, development and management of an information recovery system for an Internet Website : from documentary theory to practice (2003)
0.00
5.993188E-4 = product of:
0.0011986376 = sum of:
0.0011986376 = product of:
0.0035959128 = sum of:
0.0035959128 = weight(_text_:s in 2726) [ClassicSimilarity], result of:
0.0035959128 = score(doc=2726,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.072074346 = fieldWeight in 2726, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=2726)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Pages
- S.286-290
-
Oppenheim, C.; Morris, A.; McKnight, C.: ¬The evaluation of WWW search engines (2000)
0.00
5.993188E-4 = product of:
0.0011986376 = sum of:
0.0011986376 = product of:
0.0035959128 = sum of:
0.0035959128 = weight(_text_:s in 4546) [ClassicSimilarity], result of:
0.0035959128 = score(doc=4546,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.072074346 = fieldWeight in 4546, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=4546)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of documentation. 56(2000) no.2, S.190-211
-
Mettrop, W.; Nieuwenhuysen, P.: Internet search engines : fluctuations in document accessibility (2001)
0.00
4.994324E-4 = product of:
9.988648E-4 = sum of:
9.988648E-4 = product of:
0.0029965942 = sum of:
0.0029965942 = weight(_text_:s in 4481) [ClassicSimilarity], result of:
0.0029965942 = score(doc=4481,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 4481, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=4481)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of documentation. 57(2001) no.5, S.623-651
-
Radev, D.R.; Libner, K.; Fan, W.: Getting answers to natural language questions on the Web (2002)
0.00
4.994324E-4 = product of:
9.988648E-4 = sum of:
9.988648E-4 = product of:
0.0029965942 = sum of:
0.0029965942 = weight(_text_:s in 5204) [ClassicSimilarity], result of:
0.0029965942 = score(doc=5204,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 5204, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=5204)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and technology. 53(2002) no.5, S.359-364
-
Eastman, C.M.: 30,000 hits may be better than 300 : precision anomalies in Internet searches (2002)
0.00
4.994324E-4 = product of:
9.988648E-4 = sum of:
9.988648E-4 = product of:
0.0029965942 = sum of:
0.0029965942 = weight(_text_:s in 5231) [ClassicSimilarity], result of:
0.0029965942 = score(doc=5231,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 5231, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=5231)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.11, S.879-882
-
Sarigil, E.; Sengor Altingovde, I.; Blanco, R.; Barla Cambazoglu, B.; Ozcan, R.; Ulusoy, Ö.: Characterizing, predicting, and handling web search queries that match very few or no results (2018)
0.00
4.994324E-4 = product of:
9.988648E-4 = sum of:
9.988648E-4 = product of:
0.0029965942 = sum of:
0.0029965942 = weight(_text_:s in 4039) [ClassicSimilarity], result of:
0.0029965942 = score(doc=4039,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 4039, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=4039)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the Association for Information Science and Technology. 69(2018) no.2, S.256-270
-
Vegt, A. van der; Zuccon, G.; Koopman, B.: Do better search engines really equate to better clinical decisions? : If not, why not? (2021)
0.00
4.994324E-4 = product of:
9.988648E-4 = sum of:
9.988648E-4 = product of:
0.0029965942 = sum of:
0.0029965942 = weight(_text_:s in 150) [ClassicSimilarity], result of:
0.0029965942 = score(doc=150,freq=2.0), product of:
0.049891718 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045888513 = queryNorm
0.060061958 = fieldWeight in 150, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=150)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the Association for Information Science and Technology. 72(2021) no.2, S.141-155
