Document (#28227)

Author

Mejer, J.J.
Conkling, T.W.

Title

Google Scholar's coverage of the engineering literature : an empirical study

Source

Journal of academic librarianship. 34(2008) no.3, S.196-201

Year

2008

Abstract

Google Scholar's coverage of the engineering literature is analyzed by comparing its contents with those of Compendex, the premier engineering database. Records retrieved from Compendex were searched in Google Scholar, and a decade by decade comparison was done from the 1950s through 2007. The results show that the percentage of records appearing in Google Scholar increased over time, approaching a 90 percent matching rate for materials published after 1990.

Theme

Suchmaschinen

Field

Ingenieurwissenschaften

Object

Google Scholar
Compendex

Similar documents (content)

1. Bartenbach, B.: Compendex Plus (1995) 0.21

   0.20525603 = sum of:
     0.20525603 = product of:
       1.710467 = sum of:
         0.28553632 = weight(abstract_txt:coverage in 3003) [ClassicSimilarity], result of:
           0.28553632 = score(doc=3003,freq=1.0), product of:
             0.19032505 = queryWeight, product of:
               2.12449 = boost
               6.0010242 = idf(docFreq=298, maxDocs=44421)
               0.01492849 = queryNorm
             1.5002561 = fieldWeight in 3003, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.0010242 = idf(docFreq=298, maxDocs=44421)
               0.25 = fieldNorm(doc=3003)
         0.41723952 = weight(abstract_txt:engineering in 3003) [ClassicSimilarity], result of:
           0.41723952 = score(doc=3003,freq=1.0), product of:
             0.28054926 = queryWeight, product of:
               3.159053 = boost
               5.948895 = idf(docFreq=314, maxDocs=44421)
               0.01492849 = queryNorm
             1.4872237 = fieldWeight in 3003, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.948895 = idf(docFreq=314, maxDocs=44421)
               0.25 = fieldNorm(doc=3003)
         1.0076911 = weight(abstract_txt:compendex in 3003) [ClassicSimilarity], result of:
           1.0076911 = score(doc=3003,freq=1.0), product of:
             0.44117072 = queryWeight, product of:
               3.2345216 = boost
               9.1365185 = idf(docFreq=12, maxDocs=44421)
               0.01492849 = queryNorm
             2.2841296 = fieldWeight in 3003, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.1365185 = idf(docFreq=12, maxDocs=44421)
               0.25 = fieldNorm(doc=3003)
       0.12 = coord(3/25)
   

2. Hughes, T.; Acharya, A.: ¬An interview with Anurag Acharya, Google Scholar lead engineer 0.17

   0.17357792 = sum of:
     0.17357792 = product of:
       1.084862 = sum of:
         0.12260728 = weight(abstract_txt:approaching in 219) [ClassicSimilarity], result of:
           0.12260728 = score(doc=219,freq=1.0), product of:
             0.18670498 = queryWeight, product of:
               1.4878861 = boost
               8.405631 = idf(docFreq=26, maxDocs=44421)
               0.01492849 = queryNorm
             0.65668994 = fieldWeight in 219, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.405631 = idf(docFreq=26, maxDocs=44421)
               0.078125 = fieldNorm(doc=219)
         0.27292845 = weight(abstract_txt:scholar in 219) [ClassicSimilarity], result of:
           0.27292845 = score(doc=219,freq=4.0), product of:
             0.25263932 = queryWeight, product of:
               2.4476943 = boost
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.01492849 = queryNorm
             1.0803087 = fieldWeight in 219, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.078125 = fieldNorm(doc=219)
         0.43459168 = weight(abstract_txt:scholar's in 219) [ClassicSimilarity], result of:
           0.43459168 = score(doc=219,freq=2.0), product of:
             0.4340429 = queryWeight, product of:
               3.2082858 = boost
               9.06241 = idf(docFreq=13, maxDocs=44421)
               0.01492849 = queryNorm
             1.0012643 = fieldWeight in 219, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               9.06241 = idf(docFreq=13, maxDocs=44421)
               0.078125 = fieldNorm(doc=219)
         0.25473458 = weight(abstract_txt:google in 219) [ClassicSimilarity], result of:
           0.25473458 = score(doc=219,freq=4.0), product of:
             0.30399773 = queryWeight, product of:
               3.7971425 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.01492849 = queryNorm
             0.837949 = fieldWeight in 219, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.078125 = fieldNorm(doc=219)
       0.16 = coord(4/25)
   

3. Callicott, B.; Vaughn, D.: Google Scholar vs. Library Scholar : testing the performance of Schoogle (2005) 0.13

   0.12987034 = sum of:
     0.12987034 = product of:
       0.8116896 = sum of:
         0.06937456 = weight(abstract_txt:searched in 1357) [ClassicSimilarity], result of:
           0.06937456 = score(doc=1357,freq=1.0), product of:
             0.113107406 = queryWeight, product of:
               1.1580765 = boost
               6.5424123 = idf(docFreq=173, maxDocs=44421)
               0.01492849 = queryNorm
             0.61335117 = fieldWeight in 1357, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.5424123 = idf(docFreq=173, maxDocs=44421)
               0.09375 = fieldNorm(doc=1357)
         0.19395155 = weight(abstract_txt:premier in 1357) [ClassicSimilarity], result of:
           0.19395155 = score(doc=1357,freq=1.0), product of:
             0.22446728 = queryWeight, product of:
               1.6314293 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.01492849 = queryNorm
             0.86405265 = fieldWeight in 1357, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.09375 = fieldNorm(doc=1357)
         0.2836356 = weight(abstract_txt:scholar in 1357) [ClassicSimilarity], result of:
           0.2836356 = score(doc=1357,freq=3.0), product of:
             0.25263932 = queryWeight, product of:
               2.4476943 = boost
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.01492849 = queryNorm
             1.1226897 = fieldWeight in 1357, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.09375 = fieldNorm(doc=1357)
         0.26472798 = weight(abstract_txt:google in 1357) [ClassicSimilarity], result of:
           0.26472798 = score(doc=1357,freq=3.0), product of:
             0.30399773 = queryWeight, product of:
               3.7971425 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.01492849 = queryNorm
             0.8708222 = fieldWeight in 1357, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.09375 = fieldNorm(doc=1357)
       0.16 = coord(4/25)
   

4. López-Cózar, E.D.; Robinson-García, N.R.; Torres-Salinas, D.: ¬The Google scholar experiment : how to index false papers and manipulate bibliometric indicators (2014) 0.13

   0.12976599 = sum of:
     0.12976599 = product of:
       0.8110375 = sum of:
         0.028195376 = weight(abstract_txt:literature in 2213) [ClassicSimilarity], result of:
           0.028195376 = score(doc=2213,freq=1.0), product of:
             0.10245826 = queryWeight, product of:
               1.5587635 = boost
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.01492849 = queryNorm
             0.2751889 = fieldWeight in 2213, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.0625 = fieldNorm(doc=2213)
         0.26741418 = weight(abstract_txt:scholar in 2213) [ClassicSimilarity], result of:
           0.26741418 = score(doc=2213,freq=6.0), product of:
             0.25263932 = queryWeight, product of:
               2.4476943 = boost
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.01492849 = queryNorm
             1.058482 = fieldWeight in 2213, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.0625 = fieldNorm(doc=2213)
         0.24584217 = weight(abstract_txt:scholar's in 2213) [ClassicSimilarity], result of:
           0.24584217 = score(doc=2213,freq=1.0), product of:
             0.4340429 = queryWeight, product of:
               3.2082858 = boost
               9.06241 = idf(docFreq=13, maxDocs=44421)
               0.01492849 = queryNorm
             0.56640065 = fieldWeight in 2213, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.06241 = idf(docFreq=13, maxDocs=44421)
               0.0625 = fieldNorm(doc=2213)
         0.26958573 = weight(abstract_txt:google in 2213) [ClassicSimilarity], result of:
           0.26958573 = score(doc=2213,freq=7.0), product of:
             0.30399773 = queryWeight, product of:
               3.7971425 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.01492849 = queryNorm
             0.88680184 = fieldWeight in 2213, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.0625 = fieldNorm(doc=2213)
       0.16 = coord(4/25)
   

5. Gantman, E.R.; Dabós, M.P.: Research output and impact of the fields of management, economics, and sociology in Spain and France : an analysis using Google Scholar and Scopus (2018) 0.12

   0.122125044 = sum of:
     0.122125044 = product of:
       0.6106252 = sum of:
         0.03066661 = weight(abstract_txt:retrieved in 454) [ClassicSimilarity], result of:
           0.03066661 = score(doc=454,freq=1.0), product of:
             0.08600603 = queryWeight, product of:
               1.0098484 = boost
               5.7050157 = idf(docFreq=401, maxDocs=44421)
               0.01492849 = queryNorm
             0.35656348 = fieldWeight in 454, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.7050157 = idf(docFreq=401, maxDocs=44421)
               0.0625 = fieldNorm(doc=454)
         0.036618307 = weight(abstract_txt:comparing in 454) [ClassicSimilarity], result of:
           0.036618307 = score(doc=454,freq=1.0), product of:
             0.09680191 = queryWeight, product of:
               1.0713557 = boost
               6.0524936 = idf(docFreq=283, maxDocs=44421)
               0.01492849 = queryNorm
             0.37828085 = fieldWeight in 454, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.0524936 = idf(docFreq=283, maxDocs=44421)
               0.0625 = fieldNorm(doc=454)
         0.07138408 = weight(abstract_txt:coverage in 454) [ClassicSimilarity], result of:
           0.07138408 = score(doc=454,freq=1.0), product of:
             0.19032505 = queryWeight, product of:
               2.12449 = boost
               6.0010242 = idf(docFreq=298, maxDocs=44421)
               0.01492849 = queryNorm
             0.37506402 = fieldWeight in 454, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.0010242 = idf(docFreq=298, maxDocs=44421)
               0.0625 = fieldNorm(doc=454)
         0.24411464 = weight(abstract_txt:scholar in 454) [ClassicSimilarity], result of:
           0.24411464 = score(doc=454,freq=5.0), product of:
             0.25263932 = queryWeight, product of:
               2.4476943 = boost
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.01492849 = queryNorm
             0.9662575 = fieldWeight in 454, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.9139757 = idf(docFreq=119, maxDocs=44421)
               0.0625 = fieldNorm(doc=454)
         0.22784154 = weight(abstract_txt:google in 454) [ClassicSimilarity], result of:
           0.22784154 = score(doc=454,freq=5.0), product of:
             0.30399773 = queryWeight, product of:
               3.7971425 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.01492849 = queryNorm
             0.74948436 = fieldWeight in 454, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.0625 = fieldNorm(doc=454)
       0.2 = coord(5/25)