-
Lancaster, F.W.: MEDLARS : report on the evaluation of its operating effiency (1961)
0.02
0.01949679 = product of:
0.03899358 = sum of:
0.03899358 = product of:
0.07798716 = sum of:
0.07798716 = weight(_text_:p in 1931) [ClassicSimilarity], result of:
0.07798716 = score(doc=1931,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.47670212 = fieldWeight in 1931, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.09375 = fieldNorm(doc=1931)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Footnote
- Wiederabgedruckt in: Readings in information retrieval. Ed.: K. Sparck Jones u. P. Willett. San Francisco: Morgan Kaufmann 1997. S.223-246.
-
Cleverdon, C.W.: ¬The Cranfield tests on index language devices (1967)
0.02
0.01949679 = product of:
0.03899358 = sum of:
0.03899358 = product of:
0.07798716 = sum of:
0.07798716 = weight(_text_:p in 1957) [ClassicSimilarity], result of:
0.07798716 = score(doc=1957,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.47670212 = fieldWeight in 1957, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.09375 = fieldNorm(doc=1957)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Footnote
- Wiederabgedruckt in: Readings in information retrieval. Ed.: K. Sparck Jones u. P. Willett. San Francisco: Morgan Kaufmann 1997. S.47-58.
-
Coates, E.J.: CRG proposals for a new general classification (1969)
0.02
0.018494027 = product of:
0.036988053 = sum of:
0.036988053 = product of:
0.07397611 = sum of:
0.07397611 = weight(_text_:22 in 1283) [ClassicSimilarity], result of:
0.07397611 = score(doc=1283,freq=2.0), product of:
0.15933464 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045500398 = queryNorm
0.46428138 = fieldWeight in 1283, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.09375 = fieldNorm(doc=1283)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Pages
- S.19-22
-
Luhn, H.P.: ¬The automatic derivation of information retrieval encodements from machine-readable texts (1961)
0.02
0.016247325 = product of:
0.03249465 = sum of:
0.03249465 = product of:
0.0649893 = sum of:
0.0649893 = weight(_text_:p in 1926) [ClassicSimilarity], result of:
0.0649893 = score(doc=1926,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.39725178 = fieldWeight in 1926, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.078125 = fieldNorm(doc=1926)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Footnote
- Wiederabgedruckt in: Readings in information retrieval. Ed.: K. Sparck Jones u. P. Willett. San Francisco: Morgan Kaufmann 1997. S.21-24.
-
Mooers, C.: ¬The indexing language of an information retrieval system (1963)
0.02
0.01541169 = product of:
0.03082338 = sum of:
0.03082338 = product of:
0.06164676 = sum of:
0.06164676 = weight(_text_:22 in 1641) [ClassicSimilarity], result of:
0.06164676 = score(doc=1641,freq=2.0), product of:
0.15933464 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045500398 = queryNorm
0.38690117 = fieldWeight in 1641, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.078125 = fieldNorm(doc=1641)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Information retrieval today: papers presented at an Institute conducted by the Library School and the Cetre for Continuation Study, University of Minnesota, Sept. 19-22, 1962. Ed. by. Wesley Simonton
-
Habermas, J.: Technik und Wissenschaft als »Ideologie« (1968)
0.01
0.0130772535 = product of:
0.026154507 = sum of:
0.026154507 = product of:
0.052309014 = sum of:
0.052309014 = weight(_text_:22 in 1032) [ClassicSimilarity], result of:
0.052309014 = score(doc=1032,freq=4.0), product of:
0.15933464 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045500398 = queryNorm
0.32829654 = fieldWeight in 1032, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=1032)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 7.2023 20:22:54
-
Melton, J.S.: ¬A use for the techniques of structural linguistics in documentation research (1965)
0.01
0.01299786 = product of:
0.02599572 = sum of:
0.02599572 = product of:
0.05199144 = sum of:
0.05199144 = weight(_text_:p in 834) [ClassicSimilarity], result of:
0.05199144 = score(doc=834,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.31780142 = fieldWeight in 834, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0625 = fieldNorm(doc=834)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Classification research. Proc. 2nd Int. Study Conf. ... Elsinore, 14.-18.8.1964. Ed.: P. Atherton
-
Wilson, P.: Subjects and the sense of position (1968)
0.01
0.01299786 = product of:
0.02599572 = sum of:
0.02599572 = product of:
0.05199144 = sum of:
0.05199144 = weight(_text_:p in 1353) [ClassicSimilarity], result of:
0.05199144 = score(doc=1353,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.31780142 = fieldWeight in 1353, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0625 = fieldNorm(doc=1353)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Soergel, D.: Mathematical analysis of documentation systems : an attempt to a theory of classification and search request formulation (1967)
0.01
0.011488594 = product of:
0.022977188 = sum of:
0.022977188 = product of:
0.045954376 = sum of:
0.045954376 = weight(_text_:p in 5449) [ClassicSimilarity], result of:
0.045954376 = score(doc=5449,freq=4.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.28089944 = fieldWeight in 5449, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0390625 = fieldNorm(doc=5449)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- As an attempt to make a general structural theory of information retrieval, a documentation system (DS) is defined as a formal system consisting of (a) a set o of objects (documents); (b) a set A++ of elementary attributes (key-words), from which further attributes may be constructed: A++ generates A; (c) a set of axioms of the form X++(x)=m (m¯M, M a set of constant connecting attributes with objects: from the axioms further theorems (=true statements) may be constructed. By use of the theorems, different mappings O -> P(o) (P(o) set of all subsets of o) (search question -> set of documents retrieved) are defined. The type of a DS depends on two basic decisions: (1) choice of the rules for the construction of attributes and theorems, e.g., logical product in coordinate indexing; links. (2) choice of M; M may consist of the two constants 'applicable' and 'not applicable', or some positive integers, ...; Further practical decisions: A++ hierarchical or not; kind of mapping; introduction of roles (=further attributes). The most simple case - ordinary two-valued Coordinate Indexing - is discusssed in detail; o is a free distributive (but not Boolean) lattice, the homographic image a ring of subsets of o; instead of negation which is not useful, a useful retrieval operation 'praeternagation' is introduced. Furthermore these are discussed: a generalized definition of superimposed coding, some functions for the distance of objects or attributes; optimization and automatic derivation of classifications. The model takes into account term-term relations and document-document relations. It may serve as a structural framework in terms of which the functional problems of retrieval theory may be expressed more clearly
-
Hillman, D.J.: Mathematical classification techniques for nonstatic document collections, with particular reference to the problem of relevance (1965)
0.01
0.011373127 = product of:
0.022746254 = sum of:
0.022746254 = product of:
0.045492508 = sum of:
0.045492508 = weight(_text_:p in 5516) [ClassicSimilarity], result of:
0.045492508 = score(doc=5516,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.27807623 = fieldWeight in 5516, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0546875 = fieldNorm(doc=5516)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Classification research. Proc. of the 2nd Int. Study Conf. ... , Elsinore, 14.-18.9.1964. Ed.: P. Atherton
-
Blagden, J.F.: How much noise in a role-free and link-free co-ordinate indexing system? (1966)
0.01
0.010788183 = product of:
0.021576365 = sum of:
0.021576365 = product of:
0.04315273 = sum of:
0.04315273 = weight(_text_:22 in 2718) [ClassicSimilarity], result of:
0.04315273 = score(doc=2718,freq=2.0), product of:
0.15933464 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045500398 = queryNorm
0.2708308 = fieldWeight in 2718, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=2718)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of documentation. 22(1966), S.203-209
-
Ranganathan, S.R.: Library classification through a century (1965)
0.01
0.009748395 = product of:
0.01949679 = sum of:
0.01949679 = product of:
0.03899358 = sum of:
0.03899358 = weight(_text_:p in 1835) [ClassicSimilarity], result of:
0.03899358 = score(doc=1835,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.23835106 = fieldWeight in 1835, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.046875 = fieldNorm(doc=1835)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Classification research. Proc. of the 2nd Int. Study Conf. ... Elsinore, 14.-18.9.1964. Ed. by P. Atherton
-
Maron, M.E.; Kuhns, I.L.: On relevance, probabilistic indexing and information retrieval (1960)
0.01
0.008123662 = product of:
0.016247325 = sum of:
0.016247325 = product of:
0.03249465 = sum of:
0.03249465 = weight(_text_:p in 1928) [ClassicSimilarity], result of:
0.03249465 = score(doc=1928,freq=2.0), product of:
0.16359726 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.045500398 = queryNorm
0.19862589 = fieldWeight in 1928, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0390625 = fieldNorm(doc=1928)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Footnote
- Wiederabgedruckt in: Readings in information retrieval. Ed.: K. Sparck Jones u. P. Willett. San Francisco: Morgan Kaufmann 1997. S.39-46.