Search (12 results, page 1 of 1)

  • × theme_ss:"OPAC"
  • × theme_ss:"Retrievalstudien"
  1. Borgman, C.L.: Why are online catalogs still hard to use? (1996) 0.01 
    0.0052469834 = product of:
  0.03672888 = sum of:
    0.012762521 = weight(_text_:information in 4380) [ClassicSimilarity], result of:
      0.012762521 = score(doc=4380,freq=20.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.2453355 = fieldWeight in 4380, product of:
          4.472136 = tf(freq=20.0), with freq of:
            20.0 = termFreq=20.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.03125 = fieldNorm(doc=4380)
    0.023966359 = weight(_text_:retrieval in 4380) [ClassicSimilarity], result of:
      0.023966359 = score(doc=4380,freq=8.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.26736724 = fieldWeight in 4380, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.03125 = fieldNorm(doc=4380)
  0.14285715 = coord(2/14)
    Abstract
    We return to arguments made 10 years ago that online catalogs are difficult to use because their design does not incorporate sufficient understanding of searching behavior. The earlier article examined studies of information retrieval system searching for their implications for online catalog design; this article examines the implications of card catalog design for online catalogs. With this analysis, we hope to contribute to a better understanding of user behavior and to lay to rest the card catalog design model for online catalogs. We discuss the problems with query matching systems, which were designed for skilled search intermediaries rather than end-users, and the knowledge and skills they require in the information-seeking process, illustrated with examples of searching card and online catalogs. Searching requires conceptual knowledge of the information retrieval process - translating an information need into a searchable query; semantic knowledge of how to implement a query in a given system - the how and when to use system features; and technical skills in executing the query - basic computing skills and the syntax of entering queries as specific search statements. In the short term, we can help make online catalogs easier to use through improved training and documentation that is based on information-seeking bahavior, with the caveat that good training is not a substitute for good system design. Our long term goal should be to design intuitive systems that require a minimum of instruction. Given the complexity of the information retrieval problem and the limited capabilities of today's systems, we are far from achieving that goal. If libraries are to provide primary information services for the networked world, they need to put research results on the information-seeking process into practice in designing the next generation of online public access information retrieval systems
    Source
    Journal of the American Society for Information Science. 47(1996) no.7, S.493-503
  2. Kilgour, F.G.; Moran, B.B.; Barden, J.R.: Retrieval effectiveness of surname-title-word searches for known items by academic library users (1999) 0.01 
    0.00524566 = product of:
  0.036719617 = sum of:
    0.0070627616 = weight(_text_:information in 3061) [ClassicSimilarity], result of:
      0.0070627616 = score(doc=3061,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.13576832 = fieldWeight in 3061, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0546875 = fieldNorm(doc=3061)
    0.029656855 = weight(_text_:retrieval in 3061) [ClassicSimilarity], result of:
      0.029656855 = score(doc=3061,freq=4.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.33085006 = fieldWeight in 3061, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=3061)
  0.14285715 = coord(2/14)
    Abstract
    This article reports the findings of an experiment using a simulated title pages, author surnames, and title words, one-third of which were selected by each of the 3 authors, to determine the frequency of one-screen displays when used to search for known items in an implied Boolean retrieval system. Searches comprising surname plus one significant title word produced one-screen displays 78% of time; surname plus 2 words 97% of the time; and surname plus 3 words 98,5%. Three quarters of the significant words were nouns
    Source
    Journal of the American Society for Information Science. 50(1999) no.3, S.265-270
  3. Drabenstott, K.M.; Weller, M.S.: Improving personal-name searching in online catalogs (1996) 0.00 
    0.004004761 = product of:
  0.028033325 = sum of:
    0.0070627616 = weight(_text_:information in 6742) [ClassicSimilarity], result of:
      0.0070627616 = score(doc=6742,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.13576832 = fieldWeight in 6742, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0546875 = fieldNorm(doc=6742)
    0.020970564 = weight(_text_:retrieval in 6742) [ClassicSimilarity], result of:
      0.020970564 = score(doc=6742,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.23394634 = fieldWeight in 6742, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=6742)
  0.14285715 = coord(2/14)
    Abstract
    Reports results of a study to examine the performance of online catalogue searches involving personal names and to recommend improvements to the basic system approach to soliciting user queries and searching for them. The research questions addressed in the study wre: how online systems can chose searching approaches on their own that are likely to produce useful retrieval; how online systems solicit queries from users; and how users respond to an experimental online catalogue that prompts them for the different elements of their personal name queries. Improvements include: the implementation of a new design for online catalogue searching that features search trees; new methods for soliciting user queries bearing personal names; and enlisting the participation of online catalogue users in the evaluation of system prompts, instructions, and messages that request input from them
    Source
    Information technology and libraries. 15(1996) no.3, S.135-155
  4. Johnson, K.E.: OPAC missing record retrieval (1996) 0.00 
    0.0034326524 = product of:
  0.024028566 = sum of:
    0.0060537956 = weight(_text_:information in 6735) [ClassicSimilarity], result of:
      0.0060537956 = score(doc=6735,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.116372846 = fieldWeight in 6735, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.046875 = fieldNorm(doc=6735)
    0.01797477 = weight(_text_:retrieval in 6735) [ClassicSimilarity], result of:
      0.01797477 = score(doc=6735,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.20052543 = fieldWeight in 6735, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=6735)
  0.14285715 = coord(2/14)
    Source
    Information technology and libraries. 15(1996) no.3, S.169-171
  5. Cooper, M.D.; Chen, H.-M.: Predicting the relevance of a library catalog search (2001) 0.00 
    0.0028079567 = product of:
  0.019655695 = sum of:
    0.013948122 = weight(_text_:web in 6519) [ClassicSimilarity], result of:
      0.013948122 = score(doc=6519,freq=2.0), product of:
        0.09670874 = queryWeight, product of:
          3.2635105 = idf(docFreq=4597, maxDocs=44218)
          0.029633347 = queryNorm
        0.14422815 = fieldWeight in 6519, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.2635105 = idf(docFreq=4597, maxDocs=44218)
          0.03125 = fieldNorm(doc=6519)
    0.005707573 = weight(_text_:information in 6519) [ClassicSimilarity], result of:
      0.005707573 = score(doc=6519,freq=4.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.10971737 = fieldWeight in 6519, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.03125 = fieldNorm(doc=6519)
  0.14285715 = coord(2/14)
    Abstract
    Relevance has been a difficult concept to define, let alone measure. In this paper, a simple operational definition of relevance is proposed for a Web-based library catalog: whether or not during a search session the user saves, prints, mails, or downloads a citation. If one of those actions is performed, the session is considered relevant to the user. An analysis is presented illustrating the advantages and disadvantages of this definition. With this definition and good transaction logging, it is possible to ascertain the relevance of a session. This was done for 905,970 sessions conducted with the University of California's Melvyl online catalog. Next, a methodology was developed to try to predict the relevance of a session. A number of variables were defined that characterize a session, none of which used any demographic information about the user. The values of the variables were computed for the sessions. Principal components analysis was used to extract a new set of variables out of the original set. A stratified random sampling technique was used to form ten strata such that each new strata of 90,570 sessions contained the same proportion of relevant to nonrelevant sessions. Logistic regression was used to ascertain the regression coefficients for nine of the ten strata. Then, the coefficients were used to predict the relevance of the sessions in the missing strata. Overall, 17.85% of the sessions were determined to be relevant. The predicted number of relevant sessions for all ten strata was 11 %, a 6.85% difference. The authors believe that the methodology can be further refined and the prediction improved. This methodology could also have significant application in improving user searching and also in predicting electronic commerce buying decisions without the use of personal demographic data
    Source
    Journal of the American Society for Information Science and technology. 52(2001) no.10, S.813-827
  6. Wien, C.: Sample sizes and composition : their effect on recall and precision in IR experiments with OPACs (2000) 0.00 
    0.0025944347 = product of:
  0.036322083 = sum of:
    0.036322083 = weight(_text_:retrieval in 5368) [ClassicSimilarity], result of:
      0.036322083 = score(doc=5368,freq=6.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.40520695 = fieldWeight in 5368, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5368)
  0.071428575 = coord(1/14)
    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.
  7. Robertson, S.E.; Walker, S.; Beaulieu, M.: Experimentation as a way of life : Okapi at TREC (2000) 0.00 
    8.64828E-4 = product of:
  0.012107591 = sum of:
    0.012107591 = weight(_text_:information in 6030) [ClassicSimilarity], result of:
      0.012107591 = score(doc=6030,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.23274569 = fieldWeight in 6030, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.09375 = fieldNorm(doc=6030)
  0.071428575 = coord(1/14)
    Source
    Information processing and management. 36(2000) no.1, S.95-108
  8. Pedersen, J.O.; Silverstein, C.; Vogt, C.C.: Verity at TREC-6 : out-of-the-box and beyond (2000) 0.00 
    8.64828E-4 = product of:
  0.012107591 = sum of:
    0.012107591 = weight(_text_:information in 6427) [ClassicSimilarity], result of:
      0.012107591 = score(doc=6427,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.23274569 = fieldWeight in 6427, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.09375 = fieldNorm(doc=6427)
  0.071428575 = coord(1/14)
    Source
    Information processing and management. 36(2000) no.1, S.187-196
  9. Kilgour, F.G.; Moran, B.B.: Surname plus recallable title word searches for known items by scholars (2000) 0.00 
    5.7655195E-4 = product of:
  0.008071727 = sum of:
    0.008071727 = weight(_text_:information in 4296) [ClassicSimilarity], result of:
      0.008071727 = score(doc=4296,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.1551638 = fieldWeight in 4296, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0625 = fieldNorm(doc=4296)
  0.071428575 = coord(1/14)
    Source
    Journal of the American Society for Information Science. 51(2000) no.1, S.83-89
  10. Peters, T.A.; Kurth, M.: Controlled and uncontrolled vocabulary subject searching in an academic library online catalog (1991) 0.00 
    5.04483E-4 = product of:
  0.0070627616 = sum of:
    0.0070627616 = weight(_text_:information in 2348) [ClassicSimilarity], result of:
      0.0070627616 = score(doc=2348,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.13576832 = fieldWeight in 2348, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0546875 = fieldNorm(doc=2348)
  0.071428575 = coord(1/14)
    Source
    Information technology and libraries. 10(1991), S.201-211
  11. Tillotson, J.: Is keyword searching the answer? (1995) 0.00 
    5.04483E-4 = product of:
  0.0070627616 = sum of:
    0.0070627616 = weight(_text_:information in 1857) [ClassicSimilarity], result of:
      0.0070627616 = score(doc=1857,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.13576832 = fieldWeight in 1857, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, 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
  12. Schultz Jr., W.N.; Braddy, L.: ¬A librarian-centered study of perceptions of subject terms and controlled vocabulary (2017) 0.00 
    5.04483E-4 = product of:
  0.0070627616 = sum of:
    0.0070627616 = weight(_text_:information in 5156) [ClassicSimilarity], result of:
      0.0070627616 = score(doc=5156,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.13576832 = fieldWeight in 5156, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5156)
  0.071428575 = coord(1/14)
    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.

Authors

Years