DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984)
0.01
0.005520997 = product of:
0.038646977 = sum of:
0.038646977 = product of:
0.09661744 = sum of:
0.05731767 = weight(_text_:retrieval in 828) [ClassicSimilarity], result of:
0.05731767 = score(doc=828,freq=10.0), product of:
0.109568894 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.03622214 = queryNorm
0.5231199 = fieldWeight in 828, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.0546875 = fieldNorm(doc=828)
0.039299767 = weight(_text_:system in 828) [ClassicSimilarity], result of:
0.039299767 = score(doc=828,freq=4.0), product of:
0.11408355 = queryWeight, product of:
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.03622214 = 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)
0.4 = coord(2/5)
0.14285715 = coord(1/7)
- 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)
Verbale Doksprachen im Online-Retrieval
