-
Schultz Jr., W.N.; Braddy, L.: ¬A librarian-centered study of perceptions of subject terms and controlled vocabulary (2017)
0.04
0.035516314 = product of:
0.124307096 = sum of:
0.042009152 = weight(_text_:subject in 5156) [ClassicSimilarity], result of:
0.042009152 = score(doc=5156,freq=4.0), product of:
0.10738805 = queryWeight, product of:
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.03002521 = queryNorm
0.3911902 = fieldWeight in 5156, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.0546875 = fieldNorm(doc=5156)
0.023552012 = weight(_text_:classification in 5156) [ClassicSimilarity], result of:
0.023552012 = score(doc=5156,freq=2.0), product of:
0.09562149 = queryWeight, product of:
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.03002521 = queryNorm
0.24630459 = fieldWeight in 5156, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.0546875 = fieldNorm(doc=5156)
0.035193928 = weight(_text_:bibliographic in 5156) [ClassicSimilarity], result of:
0.035193928 = score(doc=5156,freq=2.0), product of:
0.11688946 = queryWeight, product of:
3.893044 = idf(docFreq=2449, maxDocs=44218)
0.03002521 = queryNorm
0.30108726 = fieldWeight in 5156, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.893044 = idf(docFreq=2449, maxDocs=44218)
0.0546875 = fieldNorm(doc=5156)
0.023552012 = weight(_text_:classification in 5156) [ClassicSimilarity], result of:
0.023552012 = score(doc=5156,freq=2.0), product of:
0.09562149 = queryWeight, product of:
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.03002521 = queryNorm
0.24630459 = fieldWeight in 5156, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.0546875 = fieldNorm(doc=5156)
0.2857143 = coord(4/14)
- Abstract
- Controlled vocabulary and subject headings in OPAC records have proven to be useful in improving search results. The authors used a survey to gather information about librarian opinions and professional use of controlled vocabulary. Data from a range of backgrounds and expertise were examined, including academic and public libraries, and technical services as well as public services professionals. Responses overall demonstrated positive opinions of the value of controlled vocabulary, including in reference interactions as well as during bibliographic instruction sessions. Results are also examined based upon factors such as age and type of librarian.
- Source
- Cataloging and classification quarterly. 55(2017) no.7/8, S.456-466
-
Wien, C.: Sample sizes and composition : their effect on recall and precision in IR experiments with OPACs (2000)
0.02
0.016459066 = product of:
0.076808974 = sum of:
0.029704956 = weight(_text_:subject in 5368) [ClassicSimilarity], result of:
0.029704956 = score(doc=5368,freq=2.0), product of:
0.10738805 = queryWeight, product of:
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.03002521 = queryNorm
0.27661324 = fieldWeight in 5368, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.0546875 = fieldNorm(doc=5368)
0.023552012 = weight(_text_:classification in 5368) [ClassicSimilarity], result of:
0.023552012 = score(doc=5368,freq=2.0), product of:
0.09562149 = queryWeight, product of:
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.03002521 = queryNorm
0.24630459 = fieldWeight in 5368, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.0546875 = fieldNorm(doc=5368)
0.023552012 = weight(_text_:classification in 5368) [ClassicSimilarity], result of:
0.023552012 = score(doc=5368,freq=2.0), product of:
0.09562149 = queryWeight, product of:
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.03002521 = queryNorm
0.24630459 = fieldWeight in 5368, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.1847067 = idf(docFreq=4974, maxDocs=44218)
0.0546875 = fieldNorm(doc=5368)
0.21428572 = coord(3/14)
- Abstract
- This article discusses how samples of records for laboratory IR experiments on OPACs can be constructed so that results obtained from different experiments can be compared. The literature on laboratory IR experiments seems to indicate that the retrieval effectiveness (recall and precision) is affected by the way the samples of records for such experiments are generated. Especially the amount of records and the subject area coverage of the records seems to affect the retrieval effectiveness. This article contains suggestions for the construction of samples for laboratory IR experiments on OPACs and demonstrates that the retrieval effectiveness is affected by different sample size and composition.
- Source
- Cataloging and classification quarterly. 29(2000) no.4, S.73-86
-
Lancaster, F.W.; Connell, T.H.; Bishop, N.; McCowan, S.: Identifying barriers to effective subject access in library catalogs (1991)
0.00
0.0047444506 = product of:
0.066422306 = sum of:
0.066422306 = weight(_text_:subject in 2259) [ClassicSimilarity], result of:
0.066422306 = score(doc=2259,freq=10.0), product of:
0.10738805 = queryWeight, product of:
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.03002521 = queryNorm
0.61852604 = fieldWeight in 2259, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.0546875 = fieldNorm(doc=2259)
0.071428575 = coord(1/14)
- Abstract
- 51 subject searches were performed in an online catalog containing about 4,5 million records. Their success was judges in terms of lists of items, known to be relevant to the various topics, compiled by subject specialists (faculty members or authors of articles in specialized encyclopedias). Many of the items known to be relevant were not retrieved, even in very broad searches that sometimes retrieved several hundred records, and very little could be done to make them retrievable within the constraints of present cataloging practice. Librarians should recognize that library catalogs, as now implemented, offer only the most primitive of subject access and should seek to develop different types of subject access tools. - Vgl auch Letter (B.H. Weinberg) in: LTRS 36(1992) S.123-124.
-
Peters, T.A.; Kurth, M.: Controlled and uncontrolled vocabulary subject searching in an academic library online catalog (1991)
0.00
0.0036750357 = product of:
0.0514505 = sum of:
0.0514505 = weight(_text_:subject in 2348) [ClassicSimilarity], result of:
0.0514505 = score(doc=2348,freq=6.0), product of:
0.10738805 = queryWeight, product of:
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.03002521 = queryNorm
0.4791082 = fieldWeight in 2348, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.0546875 = fieldNorm(doc=2348)
0.071428575 = coord(1/14)
- Abstract
- An analysis of transaction logs from an academic library online catalog describes instances in which users have tried both controlled and uncontrolled (title keyword) vocabulary subject access during the same search session. Eight hypotheses were tested. Over 6.6% of all dial access search sessions contained both methods of subject access. Over 58% of the isolated sessions began with an uncontrolled vocabulary attempt. Over 76% contained only one vocabulary shift. On average, user persistence was greater during controlled vocabulary search logs, but search output was greater during uncontrolled vocabulary search logs. Several recommendations regarding catalog design and instruction are made.
-
Tillotson, J.: Is keyword searching the answer? (1995)
0.00
0.0036750357 = product of:
0.0514505 = sum of:
0.0514505 = weight(_text_:subject in 1857) [ClassicSimilarity], result of:
0.0514505 = score(doc=1857,freq=6.0), product of:
0.10738805 = queryWeight, product of:
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.03002521 = queryNorm
0.4791082 = fieldWeight in 1857, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.576596 = idf(docFreq=3361, maxDocs=44218)
0.0546875 = fieldNorm(doc=1857)
0.071428575 = coord(1/14)
- Abstract
- Examines 3 aspects of keyword searching to see if defaulting to keyword searches might serve as a solution to the problems users find when performing subject searches in OPACs. Investigates if keyword searching produces useful results; if people who use keyword searches to find information on a subject report that they are satisfied with the results; and how keyword searching and controlled vocabulary searching are offered and explained in currently available OPAC interfaces. Concludes that both keyword and controlled vocabulary searching ought to be easily available in an OPAC, and that improvements need to be made in explanation and help offered to subject searchers
-
Johnson, K.E.: OPAC missing record retrieval (1996)
0.00
0.0021547303 = product of:
0.030166224 = sum of:
0.030166224 = weight(_text_:bibliographic in 6735) [ClassicSimilarity], result of:
0.030166224 = score(doc=6735,freq=2.0), product of:
0.11688946 = queryWeight, product of:
3.893044 = idf(docFreq=2449, maxDocs=44218)
0.03002521 = queryNorm
0.2580748 = fieldWeight in 6735, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.893044 = idf(docFreq=2449, maxDocs=44218)
0.046875 = fieldNorm(doc=6735)
0.071428575 = coord(1/14)
- Abstract
- Reports results of a study, conducted at Rhode Island University Library, to determine whether cataloguing records known to be missing from a library consortium OPAC database could be identified using the database search features. Attempts to create lists of bibliographic records held by other libraries in the consortium using Boolean searching features failed due to search feature limitations. Samples of search logic were created, collections of records based on this logic were assembled manually and then compared with card catalogue of the single library. Results suggest that use of the Boolean OR operator to conduct the broadest possible search could find 56.000 of the library's missing records that were held by other libraries. Use of the Boolean AND operator to conduct the narrowest search found 85.000 missing records. A specific library search made of the records of the most likely consortium library to have overlaid the single library's holdings found that 80.000 of the single library's missing records were held by a specific library
