-
Grasso, L.L.; Wahlig, H.: Google und seine Suchparameter : Eine Top 20-Precision Analyse anhand repräsentativ ausgewählter Anfragen (2005)
0.02
0.019725293 = product of:
0.039450586 = sum of:
0.039450586 = product of:
0.07890117 = sum of:
0.07890117 = weight(_text_:56 in 3275) [ClassicSimilarity], result of:
0.07890117 = score(doc=3275,freq=2.0), product of:
0.21469334 = queryWeight, product of:
4.1578603 = idf(docFreq=1879, maxDocs=44218)
0.051635534 = queryNorm
0.36750638 = fieldWeight in 3275, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1578603 = idf(docFreq=1879, maxDocs=44218)
0.0625 = fieldNorm(doc=3275)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Information - Wissenschaft und Praxis. 56(2005) H.2, S.77-86
-
Oppenheim, C.; Morris, A.; McKnight, C.: ¬The evaluation of WWW search engines (2000)
0.01
0.01479397 = product of:
0.02958794 = sum of:
0.02958794 = product of:
0.05917588 = sum of:
0.05917588 = weight(_text_:56 in 4546) [ClassicSimilarity], result of:
0.05917588 = score(doc=4546,freq=2.0), product of:
0.21469334 = queryWeight, product of:
4.1578603 = idf(docFreq=1879, maxDocs=44218)
0.051635534 = queryNorm
0.2756298 = fieldWeight in 4546, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1578603 = idf(docFreq=1879, maxDocs=44218)
0.046875 = fieldNorm(doc=4546)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of documentation. 56(2000) no.2, S.190-211
-
Dresel, R.; Hörnig, D.; Kaluza, H.; Peter, A.; Roßmann, A.; Sieber, W.: Evaluation deutscher Web-Suchwerkzeuge : Ein vergleichender Retrievaltest (2001)
0.01
0.013991804 = product of:
0.027983608 = sum of:
0.027983608 = product of:
0.055967215 = sum of:
0.055967215 = weight(_text_:22 in 261) [ClassicSimilarity], result of:
0.055967215 = score(doc=261,freq=2.0), product of:
0.18081884 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.051635534 = 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)
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