Concepts
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Bibliographic remarks The early work of H
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Two AUTOMATIC TEXT ANALYSIS Introduction Before a computerised information retrieval system can actually operate to retrieve some information,that information must have already been stored inside the computer
...The starting point of the text analysis process may be the complete document text,an abstract,the title only,or perhaps a list of words only
...The developments and advances in the process of representation have been reviewed every year by the appropriate chapters of Cuadra s Annual Review of Information Science and Technology
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Sparck Jones has carried on this work using measures of association between keywords based on their frequency of co occurrence that is,the frequency with which any two keywords occur together in the same document
...The term information structure for want of better words covers specifically a logical organisation of information,such as document representatives,for the purpose of information retrieval
...The organisation of these files is produced by an automatic classification method
...Evaluation of retrieval systems has proved extremely difficult
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In basing a theory of evaluation on the theory of measurement,is it possible to devise a measure of effectiveness not starting with precision and recall but simply with the set of relevant documents and the set of retrieved documents?If so,can we generalise such a measure to take account of degree of relevance?An alternative derivation of an E type measure could be done in terms of recall and fallout
...Up to now the measurement of effectiveness has proved fairly intractable to statistical analysis
...I think the Robertson model described in Chapter 7 goes some way to being considered as a reasonable statistical model
...There may be laws of retrieval such as the well known trade off between precision and recall that are worth establishing either empirically or by theoretical argument
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...There is a need for more intensive research into the problems of what to use to represent the content of documents in a computer
...Information retrieval systems,both operational and experimental,have been keyword based
...The major reason for this rather simple minded approach to document retrieval is a very good one
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The process may involve structuring the information in some appropriate way,such as classifying it
...Finally,we come to the output,which is usually a set of citations or document numbers
...IR in perspective This section is not meant to constitute an attempt at an exhaustive and complete account of the historical development of IR
...Since the emphasis in this book is on a particular approach to document representation,I shall restrict myself here to a few remarks about its history
...At this point,it may be convenient to elaborate on the use of keyword
...The use of statistical information about distributions of words in documents was further exploited by Maron and Kuhns [11]who obtained statistical associations between keywords
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upper and a lower see Figure 2
...It is interesting that these ideas are really basic to much of the later work in IR
...There is no reason why such an analysis should be restricted to just words
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DAMERAU,F
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...DE FINETTI,B
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...DISISS,Design of information systems in the social sciences
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...DOROFEYUK,A
...DOYLE,L
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...EDMUNDSON,H
...EFRON,B
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...ETZWEILER,L
...EVERITT,B
...FAIRTHORNE,R
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