Document (#4850)

Author

Nicholls, P.
Sutherland, T.

Title

CD-ROM databases : a survey of commercial publishing activity

Source

Database. 15(1992) no.1, S.36-41

Year

1992

Abstract

Reports on: commercially available CD-ROM titles for 1985-91; plots the comparative growth of CD-ROM and online titles for 1984-92; database type trends (indexes, source and reference) for 1987-91; subject distribution (social services 43%, science and technology 35%, arts and humanities 8% and general 13%); library and information science databases (including catalogues); CD-ROM hardware platform trends for 1990-91; CD-ROM update frequency trends; and overall, medium price trends for 1987-91. The medium price for CD-ROM databases has declined from $ 1273 in 1987 to $ 702 in 1991

Theme

Informationsmittel

Similar documents (author)

1. Nicholls, P.: ¬15 quick tips for navigating the CD-ROM literature (1993) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:nicholls in 3760) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 3760, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=3760)
   

2. Nicholls, P.T.: CD-ROM collection builder's toolkit : the definitive reference for CD-ROM buyers (1991) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:nicholls in 4939) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 4939, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=4939)
   

3. Nicholls, P.T.: ¬A framework for evaluating CD-ROM retrieval software (1990) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:nicholls in 5299) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 5299, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=5299)
   

4. Nicholls, P.T.: Empirical validation of Lotka's law (1986) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:nicholls in 5508) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 5508, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=5508)
   

5. Nicholls, P.: CD-ROM market directories ondisc : will that be six of one or a half dozen of the other? (1993) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:nicholls in 5820) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 5820, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=5820)
   

Similar documents (content)

1. Nicholls, P.; Sutherland, P.; Julien, C.: ¬The state of the union : CD-ROM titles in print 1993 (1994) 0.18

   0.18174945 = sum of:
     0.18174945 = product of:
       0.7572894 = sum of:
         0.060138892 = weight(abstract_txt:growth in 7972) [ClassicSimilarity], result of:
           0.060138892 = score(doc=7972,freq=1.0), product of:
             0.097408704 = queryWeight, product of:
               1.0077724 = boost
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.017123625 = queryNorm
             0.61738724 = fieldWeight in 7972, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
         0.07039561 = weight(abstract_txt:frequency in 7972) [ClassicSimilarity], result of:
           0.07039561 = score(doc=7972,freq=1.0), product of:
             0.10819102 = queryWeight, product of:
               1.0620848 = boost
               5.948895 = idf(docFreq=314, maxDocs=44421)
               0.017123625 = queryNorm
             0.6506604 = fieldWeight in 7972, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.948895 = idf(docFreq=314, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
         0.09290555 = weight(abstract_txt:hardware in 7972) [ClassicSimilarity], result of:
           0.09290555 = score(doc=7972,freq=1.0), product of:
             0.13017331 = queryWeight, product of:
               1.1649964 = boost
               6.5253177 = idf(docFreq=176, maxDocs=44421)
               0.017123625 = queryNorm
             0.7137066 = fieldWeight in 7972, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.5253177 = idf(docFreq=176, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
         0.16053373 = weight(abstract_txt:commercially in 7972) [ClassicSimilarity], result of:
           0.16053373 = score(doc=7972,freq=1.0), product of:
             0.18744405 = queryWeight, product of:
               1.3979751 = boost
               7.8302665 = idf(docFreq=47, maxDocs=44421)
               0.017123625 = queryNorm
             0.8564354 = fieldWeight in 7972, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.8302665 = idf(docFreq=47, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
         0.25132048 = weight(abstract_txt:titles in 7972) [ClassicSimilarity], result of:
           0.25132048 = score(doc=7972,freq=4.0), product of:
             0.20058699 = queryWeight, product of:
               2.0451727 = boost
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.017123625 = queryNorm
             1.2529252 = fieldWeight in 7972, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
         0.12199513 = weight(abstract_txt:databases in 7972) [ClassicSimilarity], result of:
           0.12199513 = score(doc=7972,freq=2.0), product of:
             0.17868423 = queryWeight, product of:
               2.364108 = boost
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.017123625 = queryNorm
             0.6827414 = fieldWeight in 7972, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.109375 = fieldNorm(doc=7972)
       0.24 = coord(6/25)
   

2. Amba, S.: Expert systems : a literature review (1988) 0.17

   0.16890222 = sum of:
     0.16890222 = product of:
       0.8445111 = sum of:
         0.07348186 = weight(abstract_txt:commercial in 1098) [ClassicSimilarity], result of:
           0.07348186 = score(doc=1098,freq=1.0), product of:
             0.1018481 = queryWeight, product of:
               1.0304812 = boost
               5.7718782 = idf(docFreq=375, maxDocs=44421)
               0.017123625 = queryNorm
             0.7214848 = fieldWeight in 1098, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.7718782 = idf(docFreq=375, maxDocs=44421)
               0.125 = fieldNorm(doc=1098)
         0.15221174 = weight(abstract_txt:1985 in 1098) [ClassicSimilarity], result of:
           0.15221174 = score(doc=1098,freq=1.0), product of:
             0.16550012 = queryWeight, product of:
               1.3135989 = boost
               7.357662 = idf(docFreq=76, maxDocs=44421)
               0.017123625 = queryNorm
             0.9197078 = fieldWeight in 1098, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.357662 = idf(docFreq=76, maxDocs=44421)
               0.125 = fieldNorm(doc=1098)
         0.15469147 = weight(abstract_txt:1984 in 1098) [ClassicSimilarity], result of:
           0.15469147 = score(doc=1098,freq=1.0), product of:
             0.16729274 = queryWeight, product of:
               1.3206939 = boost
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.017123625 = queryNorm
             0.9246753 = fieldWeight in 1098, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.125 = fieldNorm(doc=1098)
         0.04363538 = weight(abstract_txt:science in 1098) [ClassicSimilarity], result of:
           0.04363538 = score(doc=1098,freq=1.0), product of:
             0.090657145 = queryWeight, product of:
               1.3749269 = boost
               3.850585 = idf(docFreq=2567, maxDocs=44421)
               0.017123625 = queryNorm
             0.48132312 = fieldWeight in 1098, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.850585 = idf(docFreq=2567, maxDocs=44421)
               0.125 = fieldNorm(doc=1098)
         0.42049065 = weight(abstract_txt:1987 in 1098) [ClassicSimilarity], result of:
           0.42049065 = score(doc=1098,freq=1.0), product of:
             0.4699419 = queryWeight, product of:
               3.8339489 = boost
               7.1581726 = idf(docFreq=93, maxDocs=44421)
               0.017123625 = queryNorm
             0.8947716 = fieldWeight in 1098, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.1581726 = idf(docFreq=93, maxDocs=44421)
               0.125 = fieldNorm(doc=1098)
       0.2 = coord(5/25)
   

3. Tedd, L.A.: ¬The changing face of CD-ROM (1995) 0.16

   0.16419147 = sum of:
     0.16419147 = product of:
       0.8209573 = sum of:
         0.085049234 = weight(abstract_txt:growth in 3760) [ClassicSimilarity], result of:
           0.085049234 = score(doc=3760,freq=2.0), product of:
             0.097408704 = queryWeight, product of:
               1.0077724 = boost
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.017123625 = queryNorm
             0.8731174 = fieldWeight in 3760, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.109375 = fieldNorm(doc=3760)
         0.09290555 = weight(abstract_txt:hardware in 3760) [ClassicSimilarity], result of:
           0.09290555 = score(doc=3760,freq=1.0), product of:
             0.13017331 = queryWeight, product of:
               1.1649964 = boost
               6.5253177 = idf(docFreq=176, maxDocs=44421)
               0.017123625 = queryNorm
             0.7137066 = fieldWeight in 3760, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.5253177 = idf(docFreq=176, maxDocs=44421)
               0.109375 = fieldNorm(doc=3760)
         0.12566024 = weight(abstract_txt:titles in 3760) [ClassicSimilarity], result of:
           0.12566024 = score(doc=3760,freq=1.0), product of:
             0.20058699 = queryWeight, product of:
               2.0451727 = boost
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.017123625 = queryNorm
             0.6264626 = fieldWeight in 3760, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.109375 = fieldNorm(doc=3760)
         0.1494129 = weight(abstract_txt:databases in 3760) [ClassicSimilarity], result of:
           0.1494129 = score(doc=3760,freq=3.0), product of:
             0.17868423 = queryWeight, product of:
               2.364108 = boost
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.017123625 = queryNorm
             0.836184 = fieldWeight in 3760, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.109375 = fieldNorm(doc=3760)
         0.36792934 = weight(abstract_txt:1987 in 3760) [ClassicSimilarity], result of:
           0.36792934 = score(doc=3760,freq=1.0), product of:
             0.4699419 = queryWeight, product of:
               3.8339489 = boost
               7.1581726 = idf(docFreq=93, maxDocs=44421)
               0.017123625 = queryNorm
             0.7829251 = fieldWeight in 3760, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.1581726 = idf(docFreq=93, maxDocs=44421)
               0.109375 = fieldNorm(doc=3760)
       0.2 = coord(5/25)
   

4. Zainab, A.N.; Silva, S.M. de: Expert systems in library and information services : publication trends, authorship patterns and expressiveness of published titles (1998) 0.09

   0.09196558 = sum of:
     0.09196558 = product of:
       0.38318992 = sum of:
         0.03436508 = weight(abstract_txt:growth in 3927) [ClassicSimilarity], result of:
           0.03436508 = score(doc=3927,freq=1.0), product of:
             0.097408704 = queryWeight, product of:
               1.0077724 = boost
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.017123625 = queryNorm
             0.3527927 = fieldWeight in 3927, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.6446834 = idf(docFreq=426, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
         0.04785238 = weight(abstract_txt:1990 in 3927) [ClassicSimilarity], result of:
           0.04785238 = score(doc=3927,freq=1.0), product of:
             0.12146613 = queryWeight, product of:
               1.1253593 = boost
               6.3033047 = idf(docFreq=220, maxDocs=44421)
               0.017123625 = queryNorm
             0.39395654 = fieldWeight in 3927, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.3033047 = idf(docFreq=220, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
         0.02181769 = weight(abstract_txt:science in 3927) [ClassicSimilarity], result of:
           0.02181769 = score(doc=3927,freq=1.0), product of:
             0.090657145 = queryWeight, product of:
               1.3749269 = boost
               3.850585 = idf(docFreq=2567, maxDocs=44421)
               0.017123625 = queryNorm
             0.24066156 = fieldWeight in 3927, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.850585 = idf(docFreq=2567, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
         0.1283125 = weight(abstract_txt:declined in 3927) [ClassicSimilarity], result of:
           0.1283125 = score(doc=3927,freq=1.0), product of:
             0.23444024 = queryWeight, product of:
               1.5634345 = boost
               8.757029 = idf(docFreq=18, maxDocs=44421)
               0.017123625 = queryNorm
             0.5473143 = fieldWeight in 3927, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.757029 = idf(docFreq=18, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
         0.101548806 = weight(abstract_txt:titles in 3927) [ClassicSimilarity], result of:
           0.101548806 = score(doc=3927,freq=2.0), product of:
             0.20058699 = queryWeight, product of:
               2.0451727 = boost
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.017123625 = queryNorm
             0.5062582 = fieldWeight in 3927, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
         0.049293473 = weight(abstract_txt:databases in 3927) [ClassicSimilarity], result of:
           0.049293473 = score(doc=3927,freq=1.0), product of:
             0.17868423 = queryWeight, product of:
               2.364108 = boost
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.017123625 = queryNorm
             0.2758692 = fieldWeight in 3927, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.0625 = fieldNorm(doc=3927)
       0.24 = coord(6/25)
   

5. Budd, J.M.; Williams, K.A.: CD-ROMs in academic libraries : a survey (1993) 0.09

   0.08570533 = sum of:
     0.08570533 = product of:
       0.42852667 = sum of:
         0.05981547 = weight(abstract_txt:1990 in 7040) [ClassicSimilarity], result of:
           0.05981547 = score(doc=7040,freq=1.0), product of:
             0.12146613 = queryWeight, product of:
               1.1253593 = boost
               6.3033047 = idf(docFreq=220, maxDocs=44421)
               0.017123625 = queryNorm
             0.49244568 = fieldWeight in 7040, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.3033047 = idf(docFreq=220, maxDocs=44421)
               0.078125 = fieldNorm(doc=7040)
         0.09513234 = weight(abstract_txt:1985 in 7040) [ClassicSimilarity], result of:
           0.09513234 = score(doc=7040,freq=1.0), product of:
             0.16550012 = queryWeight, product of:
               1.3135989 = boost
               7.357662 = idf(docFreq=76, maxDocs=44421)
               0.017123625 = queryNorm
             0.57481736 = fieldWeight in 7040, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.357662 = idf(docFreq=76, maxDocs=44421)
               0.078125 = fieldNorm(doc=7040)
         0.09668217 = weight(abstract_txt:1984 in 7040) [ClassicSimilarity], result of:
           0.09668217 = score(doc=7040,freq=1.0), product of:
             0.16729274 = queryWeight, product of:
               1.3206939 = boost
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.017123625 = queryNorm
             0.57792205 = fieldWeight in 7040, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.078125 = fieldNorm(doc=7040)
         0.089757316 = weight(abstract_txt:titles in 7040) [ClassicSimilarity], result of:
           0.089757316 = score(doc=7040,freq=1.0), product of:
             0.20058699 = queryWeight, product of:
               2.0451727 = boost
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.017123625 = queryNorm
             0.44747326 = fieldWeight in 7040, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.078125 = fieldNorm(doc=7040)
         0.087139376 = weight(abstract_txt:databases in 7040) [ClassicSimilarity], result of:
           0.087139376 = score(doc=7040,freq=2.0), product of:
             0.17868423 = queryWeight, product of:
               2.364108 = boost
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.017123625 = queryNorm
             0.48767242 = fieldWeight in 7040, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.413907 = idf(docFreq=1461, maxDocs=44421)
               0.078125 = fieldNorm(doc=7040)
       0.2 = coord(5/25)