Nicholls, P.; Sutherland, T.: CD-ROM databases : a survey of commercial publishing activity (1992)
0.00
0.001682769 = product of:
0.010096614 = sum of:
0.010096614 = weight(_text_:in in 4850) [ClassicSimilarity], result of:
0.010096614 = score(doc=4850,freq=4.0), product of:
0.059380736 = queryWeight, product of:
1.3602545 = idf(docFreq=30841, maxDocs=44218)
0.043654136 = queryNorm
0.17003182 = fieldWeight in 4850, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.3602545 = idf(docFreq=30841, maxDocs=44218)
0.0625 = fieldNorm(doc=4850)
0.16666667 = coord(1/6)
- 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
