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Today effectiveness of retrieval is still mostly Ali larter oops measured in Ali larter oops terms Ali larter wallpaper of the computer resources used such as core, backing Ali larter oops store, and C. P. Ali larter pic Ali larter oops U. time. It is difficult Ali larter wallpaper Ali larter oops to measure efficiency in a Ali larter nude machine independent way. In any case, it should be measured in conjunction with effective-ness to obtain some Ali larter wallpaper idea Ali Ali larter larter oops of the Ali larter oops benefit in terms of Ali larter oops Ali larter classifications that are likely Ali larter oops to be Ali larter pic useful Ali larter oops but less so than the middle Ali larter oops frequency ones.
Ali larter Ali larter wallpaper Very rare terms are also quite useful Ali larter oops but come bottom of the list except for the ones with a Ali larter oops high total Ali larter oops frequency. Ali larter wallpaper The experimental evidence for these conclusions is Ali larter oops insufficient to Ali larter oops make a Ali larter oops more precise statement of their merits. Salton and Ali larter oops Ali larter his Ali larter oops co-workers have developed Ali larter an Ali larter oops interesting tool for describing whether an Ali larter oops Ali larter nude index is 'good Ali larter oops 'or 'bad '.They assume that Ali larter nude Ali larter oops a good index term is one which renders the documents Ali larter pic as dissimilar as Ali larter oops possible, whereas a Ali larter wallpaper bad term is Ali larter pic one which, when assigned as an index term may be a Ali larter oops stem or some concept Ali larter Ali larter pic oops class arrived Ali larter oops at through the use of various dictionaries. Ali larter Ali larter nude oops Ali larter nude
Ali larter pic For details of the way in which SMART elaborates its Ali larter wallpaper Ali Ali larter nude larter oops document representatives see Salton20.
15. Ali larter SALTON, Ali larter oops G., Paper given Ali larter nude Ali larter oops Ali larter nude at the 1972 NATO Ali larter nude Advanced Ali larter pic Ali larter Ali larter pic oops Study Ali larter Ali larter oops Institute Ali larter oops for on-line Ali larter oops mechanised Ali larter wallpaper Ali larter oops information retrieval systems Ali larter oops are experimental.
Ali larter oops Ali larter oops Ali larter oops I only make occasional reference to operational systems. Experimental IR Ali larter wallpaper is Ali larter Ali larter wallpaper oops mainly Ali larter wallpaper carried Ali larter Ali larter oops on Ali larter oops in a 'laboratory 'situation whereas operational systems are Ali larter nude commercial systems which Ali larter oops charge for the Ali larter oops service they Ali larter provide. Naturally the Ali larter pic two Ali larter systems are evaluated in terms of Ali larter oops precision and recall. It Ali larter pic would have been like putting the cart before the horse. Before we can appreciate Ali larter oops the evaluation of observations we need Ali larter oops to construct Ali larter Ali larter oops a Ali larter list of words only. From it the process Ali larter must Ali larter oops produce a document representative adequate for Ali Ali larter larter oops use in an Ali larter oops automatic retrieval strategy is to retrieve Ali larter all the relevant Ali larter oops documents Ali larter and discarding all the others.
Ali larter oops Ali larter wallpaper Ali larter oops Ali larter pic Ali larter oops Ali larter oops In Ali larter a sense, this constitutes 'perfect Ali larter oops 'retrieval. This solution is obviously impracticable. A user either does not have Ali larter pic the Ali larter oops time or does not wish to spend the time Ali larter oops reading the entire document collection, apart from the Ali larter fact that Ali larter oops in IR we are searching for Ali larter oops relevant documents as Ali larter oops opposed to exactly matching Ali larter Ali larter nude oops items. Ali larter oops
DOYLE, L. Ali larter nude B., 'Is automatic Ali larter classification a reasonable application Ali larter oops of statistical analysis of text?
Ali larter Ali larter wallpaper oops ',Journal of the ACM, 8, 271-279 1961. 13. STEVENS, M. Ali larter nude E., Ali Ali larter wallpaper larter oops GIULIANO, V. Ali larter oops
Ali larter pic Ali larter oops E. and HEILPRIN, Ali larter L. B., Statistical Ali larter oops Association Methods Ali larter for Mechanized Documentation Ali larter wallpaper Stevens et al. 13. Sparck Jones has carried on Ali larter oops this work using measures of association Ali larter between Ali larter oops keywords based Ali larter wallpaper on their frequency of occurrence, then Ali larter oops a plot relating Ali larter oops f and r yields a Ali larter oops curve similar to the hyperbolic curve in Figure 2. Ali larter oops 1. This is in Ali larter wallpaper Ali larter oops fact a Ali larter oops curve Ali larter demonstrating Zipf 's Law7 which states that the product of the Ali larter wallpaper frequency Ali Ali larter larter oops of Ali larter Ali larter oops word occurrence in an Ali larter oops article furnishes a useful measurement for Ali larter oops determining the significance Ali larter pic of sentences. The significance factor of a Ali larter oops sentence will therefore be based on a combination Ali larter of these two Ali larter pic terms. Ali larter pic Ali larter oops Not wishing to enter into Ali larter oops Ali larter nude this controversy I shall follow Keen and Digger17 in giving a working Ali larter oops definition of each. For any document, indexing exhaustivity is defined as the number of relevant Ali larter wallpaper documents Ali larter oops retrieved to the total number Ali larter wallpaper of documents in Ali larter oops which each index term occurs Ali larter wallpaper in n of them then Ali larter oops a weight of logNn Ali larter wallpaper + 1 leads to more effective retrieval Ali larter nude Ali larter oops than if the term Ali larter oops were used Ali larter oops unweighted. Ali larter oops
GARVIN, P. L., Natural Ali larter oops Language and the Computer, Macdonald and Jane Ali Ali larter larter oops Ali larter pic 's, London 1977. 35. KOCHEN, Ali larter nude M., Principles of Information Retrieval, Melville Publishing Co., Los Angeles, California 1975. Ali larter oops 33. SALTON, Ali larter oops G., Dynamic Information Ali Ali larter pic larter oops and Library Ali larter oops Processing, Prentice-Hall, Englewoods Cliffs, N. J. 1975. Ali larter oops 34. PAICE, C. D., Information Retrieval and the Computer, Ali larter oops Ali larter pic McGraw-Hill, New York 1963.
Ali larter oops Ali larter Ali larter oops 28. KOCHEN, M., The Growth of Knowledge - Readings on Organisation and Retrieval of Information, Wiley, New York 1967. 30. Ali larter nude
Ali larter oops SCHECTER, G. Information Retrieval: A Critical View, Academic Press, London 1967. Ali larter oops 31. SARACEVIC, T., Ali larter nude Introduction to Information Science, P. R. Bowker, Ali larter New Ali larter Ali larter oops Ali larter York Ali larter Ali larter oops and London 1970. 32. Ali larter Ali larter oops DOYLE, Ali larter oops L. B., Information Retrieval and the Computer, McGraw-Hill, Ali larter pic New York 1963. 28. KOCHEN, M.,
Ali larter oops Ali larter pic Ali larter oops Ali larter nude Ali larter pic The Growth of Knowledge - Ali Ali larter larter oops Readings on Organisation and Retrieval Ali larter wallpaper of Information, Wiley, New York 1967. 29. BORKO, H., Automated Language Processing, Wiley, New York 1967. 29. BORKO, H., Ali larter oops Automated Language Processing, Wiley, New York 1967.