Dykstra, M.: PRECIS in the online catalog (1989)
0.16
0.15623769 = product of:
0.26039615 = sum of:
0.09683614 = weight(_text_:context in 454) [ClassicSimilarity], result of:
0.09683614 = score(doc=454,freq=2.0), product of:
0.17622331 = queryWeight, product of:
4.14465 = idf(docFreq=1904, maxDocs=44218)
0.04251826 = queryNorm
0.54950815 = fieldWeight in 454, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.14465 = idf(docFreq=1904, maxDocs=44218)
0.09375 = fieldNorm(doc=454)
0.107641 = weight(_text_:index in 454) [ClassicSimilarity], result of:
0.107641 = score(doc=454,freq=2.0), product of:
0.18579477 = queryWeight, product of:
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.04251826 = queryNorm
0.5793543 = fieldWeight in 454, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.09375 = fieldNorm(doc=454)
0.055919025 = weight(_text_:system in 454) [ClassicSimilarity], result of:
0.055919025 = score(doc=454,freq=2.0), product of:
0.13391352 = queryWeight, product of:
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.04251826 = queryNorm
0.41757566 = fieldWeight in 454, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.09375 = fieldNorm(doc=454)
0.6 = coord(3/5)
- Theme
- Preserved Context Index System (PRECIS)
DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984)
0.10
0.0992455 = product of:
0.16540916 = sum of:
0.05648775 = weight(_text_:context in 828) [ClassicSimilarity], result of:
0.05648775 = score(doc=828,freq=2.0), product of:
0.17622331 = queryWeight, product of:
4.14465 = idf(docFreq=1904, maxDocs=44218)
0.04251826 = queryNorm
0.32054642 = fieldWeight in 828, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.14465 = idf(docFreq=1904, maxDocs=44218)
0.0546875 = fieldNorm(doc=828)
0.06279058 = weight(_text_:index in 828) [ClassicSimilarity], result of:
0.06279058 = score(doc=828,freq=2.0), product of:
0.18579477 = queryWeight, product of:
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.04251826 = queryNorm
0.33795667 = fieldWeight in 828, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.0546875 = fieldNorm(doc=828)
0.04613084 = weight(_text_:system in 828) [ClassicSimilarity], result of:
0.04613084 = score(doc=828,freq=4.0), product of:
0.13391352 = queryWeight, product of:
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.04251826 = queryNorm
0.34448233 = fieldWeight in 828, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.0546875 = fieldNorm(doc=828)
0.6 = coord(3/5)
- Abstract
- Designing research on the retrieval effectiveness of computer searches on PRECIS compared with retrieval effectiveness of searches on other types of subject analysis used in computer-based information sources is a complex process. This paper explores the complexity of measuring comparative retrieval effectiveness through a comparison of the subject analysis provided by the PRECIS system for fifty articles with the subject analysis provided for the same articles by three computer-based information sources: ERIC/CIJE, LLBA/Online and PsycINFO. Objectives are: (1) to discover factors that should be taken into account when designing this type of research; and (2) to identify extraneous variables that work against internal validity in research design .
- Theme
- Preserved Context Index System (PRECIS)