Search (3 results, page 1 of 1)

  • × theme_ss:"Retrievalstudien"
  • × theme_ss:"Suchmaschinen"
  1. Dresel, R.; Hörnig, D.; Kaluza, H.; Peter, A.; Roßmann, A.; Sieber, W.: Evaluation deutscher Web-Suchwerkzeuge : Ein vergleichender Retrievaltest (2001) 0.03
    0.03060871 = product of:
      0.06121742 = sum of:
        0.06121742 = product of:
          0.091826126 = sum of:
            0.0427692 = weight(_text_:h in 261) [ClassicSimilarity], result of:
              0.0427692 = score(doc=261,freq=6.0), product of:
                0.11244635 = queryWeight, product of:
                  2.4844491 = idf(docFreq=10020, maxDocs=44218)
                  0.045260075 = queryNorm
                0.38035205 = fieldWeight in 261, product of:
                  2.4494898 = tf(freq=6.0), with freq of:
                    6.0 = termFreq=6.0
                  2.4844491 = idf(docFreq=10020, maxDocs=44218)
                  0.0625 = fieldNorm(doc=261)
            0.04905692 = weight(_text_:22 in 261) [ClassicSimilarity], result of:
              0.04905692 = score(doc=261,freq=2.0), product of:
                0.15849307 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.045260075 = 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)
          0.6666667 = coord(2/3)
      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
    Source
    nfd Information - Wissenschaft und Praxis. 52(2001) H.7, S.381-392
  2. Oppenheim, C.; Morris, A.; McKnight, C.: ¬The evaluation of WWW search engines (2000) 0.01
    0.008414412 = product of:
      0.016828824 = sum of:
        0.016828824 = product of:
          0.050486468 = sum of:
            0.050486468 = weight(_text_:c in 4546) [ClassicSimilarity], result of:
              0.050486468 = score(doc=4546,freq=4.0), product of:
                0.15612034 = queryWeight, product of:
                  3.4494052 = idf(docFreq=3817, maxDocs=44218)
                  0.045260075 = queryNorm
                0.32338172 = fieldWeight in 4546, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  3.4494052 = idf(docFreq=3817, maxDocs=44218)
                  0.046875 = fieldNorm(doc=4546)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
  3. Grasso, L.L.; Wahlig, H.: Google und seine Suchparameter : Eine Top 20-Precision Analyse anhand repräsentativ ausgewählter Anfragen (2005) 0.01
    0.005820151 = product of:
      0.011640302 = sum of:
        0.011640302 = product of:
          0.034920905 = sum of:
            0.034920905 = weight(_text_:h in 3275) [ClassicSimilarity], result of:
              0.034920905 = score(doc=3275,freq=4.0), product of:
                0.11244635 = queryWeight, product of:
                  2.4844491 = idf(docFreq=10020, maxDocs=44218)
                  0.045260075 = queryNorm
                0.31055614 = fieldWeight in 3275, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  2.4844491 = idf(docFreq=10020, maxDocs=44218)
                  0.0625 = fieldNorm(doc=3275)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Information - Wissenschaft und Praxis. 56(2005) H.2, S.77-86