Concepts
Similar pages
| Similarity |
Page |
Snapshot |
| 9 |
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
... |
| 185 |
approaching this problem of speeding up clustering is to look for what one might call almost classifications
...A big question,that has not yet received much attention,concerns the extent to which retrieval effectiveness is limited by the type of document description used
...Document classification is a special case of a more general process which would also attempt to exploit relationships between documents
...An argument parallel to the one in the last paragraph could be given for automatic keyword classification,which in the more general context might be called automatic content unit classification
...H
... |
| 4 |
The structure of the book The introduction presents some basic background material,demarcates the subject and discusses loosely some of the problems in IR
...The two major chapters are those dealing with automatic classification and evaluation
...Outline Chapter 2:Automatic Text Analysis contains a straightforward discussion of how the text of a document is represented inside a computer
...Chapter 3:Automatic Classification looks at automatic classification methods in general and then takes a deeper look at the use of these methods in information retrieval
...Chapter 4:File Structures here we try and discuss file structures from the point of view of someone primarily interested in information retrieval
...Chapter 5:Search Strategies gives an account of some search strategies when applied to document collections structured in different ways
...Chapter 6:Probabilistic Retrieval describes a formal model for enhancing retrieval effectiveness by using sample information about the |
| 195 |
DAMERAU,F
...DAMERAU,F
...DATE,C
...DATTOLA,R
...DATTOLA,R
...DE FINETTI,B
...DENNIS,S
...DISISS,Design of information systems in the social sciences
...DODD,G
...DOROFEYUK,A
...DOYLE,L
...DOYLE,L
...DOYLE,L
...DOYLE,L
...DOYLE,L
...DOYLE,L
...DUDA,R
...EDMUNDSON,H
...EFRON,B
...EIN DOR,P
...ELLIS,B
...ETZWEILER,L
...EVERITT,B
...FAIRTHORNE,R
... |
| 58 |
structure representing it inside the computer
...Just as in many other computational problems,it is possible to trade core storage and computation time
...One important decision to be made in any retrieval system concerns the organisation of storage
...Another good example of the difference in approach between experimental and operational implementations of a classification is in the permanence of the cluster representatives
...Probably one of the most important features of a classification implementation is that it should be able to deal with a changing and growing document collection
...Although many classification algorithms claim this feature,the claim is almost invariably not met
...These comments tend to apply to the n log n classification methods
... |
| 1 |
One INTRODUCTION Information retrieval is a wide,often loosely defined term but in these pages I shall be concerned only with automatic information retrieval systems
...To make clear the difference between data retrieval DR and information retrieval IR,I have listed in Table 1
... |
| 63 |
15
...16
...17
...18
...19
...20
...21
...22
...23
...24
...25
...26
...27
...28
...29
...30
...31
...32
...33
...34
...35
...36
...37
... |
| 190 |
The lesson that is to be learnt is that should new research get underway it will be very important to have a suitable data base ready
...Information retrieval systems are likely to play an every increasing part in the community
...One major recent development is that computers and data bases are becoming linked into A study recommending the provision of such an experimental test bed has recently been completed,see Sparck Jones and van Rijsbergen,Information retrieval test collections,Journal of Documentation,32,59 75 1976
...networks
...By extending the user population to include the non specialist,it is likely that an IR system will be expected to provide not just a citation,but a display of the text,or part of it,and perhaps answer simple questions about the retrieved documents
...To bring all this about the document retrieval system will have to be interfaced and integrated with data retrieval systems,to give access to facts related to those in the documents
...Another example can be found in the context of computer aided instruction,where it is clearly a good idea to give a student access to a document retrieval system which will provide him with further reading on a topic of his immediate interest
... |
| 5 |
frequency of occurrence and co occurrence of index terms in the relevant and non relevant documents
...Chapter 7:Evaluation here I give a traditional view of the measurement of effectiveness followed by an explanation of some of the more promising attempts at improving the art
...Chapter 8:The Future contains some speculation about the future of IR and tries to pinpoint some areas of research where further work is desperately needed
...Information retrieval Since the 1940 s the problem of information storage and retrieval has attracted increasing attention
...In principle,information storage and retrieval is simple
...When high speed computers became available for non numerical work,many thought that a computer would be able to read an entire document collection to extract the relevant documents
... |
|
|
