Document (#19181)

Author

Bar-Ilan, J.

Title

Evaluating the stability of the search tools Hotbot and Snap : a case study

Source

Online information review. 24(2000) no.6, S.439-449

Year

2000

Abstract

Discusses the results of a case study in which 20 random queries were presented for ten consecutive days to Hotbot and Snap, two search tools that draw their results from the database of Inktomi. The results show huge daily fluctuations in the number of hits retrieved by Hotbot, and high stability in the hits displayed by Snap. These findings are to alert users of Hotbot of its instability as of October 1999, and they raise questions about the reliability of previous studies estimating the size of Hotbot based on its overlap with other search engines.

Theme

Suchmaschinen

Object

HotBot
Snap
Inktomi

Similar documents (author)

1. Ilan, J. Bar- => Bar-Ilan, J.: 4.29

   4.2882323 = sum of:
     4.2882323 = weight(author_txt:ilan in 3392) [ClassicSimilarity], result of:
       4.2882323 = fieldWeight in 3392, product of:
         1.4142135 = tf(freq=2.0), with freq of:
           2.0 = termFreq=2.0
         8.085969 = idf(docFreq=36, maxDocs=44218)
         0.375 = fieldNorm(doc=3392)
   

2. Ilan, E. Bar- => Bar-Ilan, E.: 4.29

   4.2882323 = sum of:
     4.2882323 = weight(author_txt:ilan in 3393) [ClassicSimilarity], result of:
       4.2882323 = fieldWeight in 3393, product of:
         1.4142135 = tf(freq=2.0), with freq of:
           2.0 = termFreq=2.0
         8.085969 = idf(docFreq=36, maxDocs=44218)
         0.375 = fieldNorm(doc=3393)
   

3. Bar-Ilan, J.: Information hub blogs (2005) 4.04

   4.0429845 = sum of:
     4.0429845 = weight(author_txt:ilan in 193) [ClassicSimilarity], result of:
       4.0429845 = fieldWeight in 193, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.085969 = idf(docFreq=36, maxDocs=44218)
         0.5 = fieldNorm(doc=193)
   

4. Bar-Ilan, J.: On the overlap, the precision and estimated recall of search engines : a case study of the query 'Erdös' (1998) 4.04

   4.0429845 = sum of:
     4.0429845 = weight(author_txt:ilan in 3753) [ClassicSimilarity], result of:
       4.0429845 = fieldWeight in 3753, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.085969 = idf(docFreq=36, maxDocs=44218)
         0.5 = fieldNorm(doc=3753)
   

5. Bar-Ilan, J.: ¬The Web as an information source on informetrics? : A content analysis (2000) 4.04

   4.0429845 = sum of:
     4.0429845 = weight(author_txt:ilan in 4587) [ClassicSimilarity], result of:
       4.0429845 = fieldWeight in 4587, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.085969 = idf(docFreq=36, maxDocs=44218)
         0.5 = fieldNorm(doc=4587)
   

Similar documents (content)

1. Notess, G.R.: Measuring the size of Internet databases (1997) 0.23

   0.23473196 = sum of:
     0.23473196 = product of:
       1.4670748 = sum of:
         0.12800157 = weight(abstract_txt:overlap in 1461) [ClassicSimilarity], result of:
           0.12800157 = score(doc=1461,freq=2.0), product of:
             0.10428566 = queryWeight, product of:
               1.1023338 = boost
               6.943297 = idf(docFreq=115, maxDocs=44218)
               0.013625289 = queryNorm
             1.227413 = fieldWeight in 1461, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.943297 = idf(docFreq=115, maxDocs=44218)
               0.125 = fieldNorm(doc=1461)
         0.039707646 = weight(abstract_txt:search in 1461) [ClassicSimilarity], result of:
           0.039707646 = score(doc=1461,freq=1.0), product of:
             0.08683888 = queryWeight, product of:
               1.7422824 = boost
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.013625289 = queryNorm
             0.45725656 = fieldWeight in 1461, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.125 = fieldNorm(doc=1461)
         0.23308876 = weight(abstract_txt:hits in 1461) [ClassicSimilarity], result of:
           0.23308876 = score(doc=1461,freq=1.0), product of:
             0.24685878 = queryWeight, product of:
               2.398502 = boost
               7.5537524 = idf(docFreq=62, maxDocs=44218)
               0.013625289 = queryNorm
             0.94421905 = fieldWeight in 1461, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.5537524 = idf(docFreq=62, maxDocs=44218)
               0.125 = fieldNorm(doc=1461)
         1.0662768 = weight(abstract_txt:hotbot in 1461) [ClassicSimilarity], result of:
           1.0662768 = score(doc=1461,freq=2.0), product of:
             0.7327981 = queryWeight, product of:
               6.5339828 = boost
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.013625289 = queryNorm
             1.4550757 = fieldWeight in 1461, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.125 = fieldNorm(doc=1461)
       0.16 = coord(4/25)
   

2. Lin, Z.; Baoming, Z.: Comparative study of WWW search tools (1998) 0.18

   0.17841604 = sum of:
     0.17841604 = product of:
       1.1151003 = sum of:
         0.05961888 = weight(abstract_txt:tools in 3558) [ClassicSimilarity], result of:
           0.05961888 = score(doc=3558,freq=1.0), product of:
             0.08572027 = queryWeight, product of:
               1.4133756 = boost
               4.451232 = idf(docFreq=1401, maxDocs=44218)
               0.013625289 = queryNorm
             0.695505 = fieldWeight in 3558, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.451232 = idf(docFreq=1401, maxDocs=44218)
               0.15625 = fieldNorm(doc=3558)
         0.042823154 = weight(abstract_txt:results in 3558) [ClassicSimilarity], result of:
           0.042823154 = score(doc=3558,freq=1.0), product of:
             0.078700446 = queryWeight, product of:
               1.658632 = boost
               3.482422 = idf(docFreq=3693, maxDocs=44218)
               0.013625289 = queryNorm
             0.5441285 = fieldWeight in 3558, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.482422 = idf(docFreq=3693, maxDocs=44218)
               0.15625 = fieldNorm(doc=3558)
         0.070193864 = weight(abstract_txt:search in 3558) [ClassicSimilarity], result of:
           0.070193864 = score(doc=3558,freq=2.0), product of:
             0.08683888 = queryWeight, product of:
               1.7422824 = boost
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.013625289 = queryNorm
             0.808323 = fieldWeight in 3558, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.15625 = fieldNorm(doc=3558)
         0.9424644 = weight(abstract_txt:hotbot in 3558) [ClassicSimilarity], result of:
           0.9424644 = score(doc=3558,freq=1.0), product of:
             0.7327981 = queryWeight, product of:
               6.5339828 = boost
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.013625289 = queryNorm
             1.2861174 = fieldWeight in 3558, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.15625 = fieldNorm(doc=3558)
       0.16 = coord(4/25)
   

3. Collier, H.: Needles in electronic haystacks (1996) 0.15

   0.1509771 = sum of:
     0.1509771 = product of:
       1.2581426 = sum of:
         0.24548429 = weight(abstract_txt:inktomi in 5791) [ClassicSimilarity], result of:
           0.24548429 = score(doc=5791,freq=1.0), product of:
             0.1747834 = queryWeight, product of:
               1.4270885 = boost
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.013625289 = queryNorm
             1.4045058 = fieldWeight in 5791, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.15625 = fieldNorm(doc=5791)
         0.070193864 = weight(abstract_txt:search in 5791) [ClassicSimilarity], result of:
           0.070193864 = score(doc=5791,freq=2.0), product of:
             0.08683888 = queryWeight, product of:
               1.7422824 = boost
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.013625289 = queryNorm
             0.808323 = fieldWeight in 5791, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.15625 = fieldNorm(doc=5791)
         0.9424644 = weight(abstract_txt:hotbot in 5791) [ClassicSimilarity], result of:
           0.9424644 = score(doc=5791,freq=1.0), product of:
             0.7327981 = queryWeight, product of:
               6.5339828 = boost
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.013625289 = queryNorm
             1.2861174 = fieldWeight in 5791, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.15625 = fieldNorm(doc=5791)
       0.12 = coord(3/25)
   

4. Raisch, M.J.: ¬The wide world of the World-Wide Web : A description of Web browsers and search engines (1996) 0.13

   0.12620614 = sum of:
     0.12620614 = product of:
       1.0517179 = sum of:
         0.05961888 = weight(abstract_txt:tools in 7473) [ClassicSimilarity], result of:
           0.05961888 = score(doc=7473,freq=1.0), product of:
             0.08572027 = queryWeight, product of:
               1.4133756 = boost
               4.451232 = idf(docFreq=1401, maxDocs=44218)
               0.013625289 = queryNorm
             0.695505 = fieldWeight in 7473, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.451232 = idf(docFreq=1401, maxDocs=44218)
               0.15625 = fieldNorm(doc=7473)
         0.049634557 = weight(abstract_txt:search in 7473) [ClassicSimilarity], result of:
           0.049634557 = score(doc=7473,freq=1.0), product of:
             0.08683888 = queryWeight, product of:
               1.7422824 = boost
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.013625289 = queryNorm
             0.5715707 = fieldWeight in 7473, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.15625 = fieldNorm(doc=7473)
         0.9424644 = weight(abstract_txt:hotbot in 7473) [ClassicSimilarity], result of:
           0.9424644 = score(doc=7473,freq=1.0), product of:
             0.7327981 = queryWeight, product of:
               6.5339828 = boost
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.013625289 = queryNorm
             1.2861174 = fieldWeight in 7473, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.15625 = fieldNorm(doc=7473)
       0.12 = coord(3/25)
   

5. Internet search tool details (1996) 0.12

   0.12419065 = sum of:
     0.12419065 = product of:
       1.0349221 = sum of:
         0.042823154 = weight(abstract_txt:results in 5677) [ClassicSimilarity], result of:
           0.042823154 = score(doc=5677,freq=1.0), product of:
             0.078700446 = queryWeight, product of:
               1.658632 = boost
               3.482422 = idf(docFreq=3693, maxDocs=44218)
               0.013625289 = queryNorm
             0.5441285 = fieldWeight in 5677, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.482422 = idf(docFreq=3693, maxDocs=44218)
               0.15625 = fieldNorm(doc=5677)
         0.049634557 = weight(abstract_txt:search in 5677) [ClassicSimilarity], result of:
           0.049634557 = score(doc=5677,freq=1.0), product of:
             0.08683888 = queryWeight, product of:
               1.7422824 = boost
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.013625289 = queryNorm
             0.5715707 = fieldWeight in 5677, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6580524 = idf(docFreq=3098, maxDocs=44218)
               0.15625 = fieldNorm(doc=5677)
         0.9424644 = weight(abstract_txt:hotbot in 5677) [ClassicSimilarity], result of:
           0.9424644 = score(doc=5677,freq=1.0), product of:
             0.7327981 = queryWeight, product of:
               6.5339828 = boost
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.013625289 = queryNorm
             1.2861174 = fieldWeight in 5677, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.231152 = idf(docFreq=31, maxDocs=44218)
               0.15625 = fieldNorm(doc=5677)
       0.12 = coord(3/25)