| Similarity |
Page |
Snapshot |
| 10 |
In the past there has been much debate about the validity of evaluations based on relevance judgments provided by erring human beings
...Effectiveness and efficiency Much of the research and development in information retrieval is aimed at improving the effectiveness and efficiency of retrieval
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| 3 |
that in IR we are searching for relevant documents as opposed to exactly matching items
...Many automatic information retrieval systems are experimental
...Many of the techniques I shall discuss will not have proved themselves incontrovertibly superior to all other techniques,but they have promise and their promise will only be realised when they are understood
...My aim throughout has been to give a complete coverage of the more important ideas current in various special areas of information retrieval
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| 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
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| 144 |
Seven EVALUATION Introduction Much effort and research has gone into solving the problem of evaluation of information retrieval systems
...In a book of this nature it will be impossible to cover all work to date about evaluation
...To put the problem of evaluation in perspective let me pose three questions:1 Why evaluate?2 What to evaluate?3 How to evaluate?The answers to these questions pretty well cover the whole field of evaluation
...The answer to the first question is mainly a social and economic one
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| 187 |
Probabilistic search strategies have not been investigated much either,although such strategies have been tried with some effect in the fields of pattern recognition and automatic medical diagnosis
...In Chapter 5 I mentioned that bottom up search strategies are apparently more successful than The work described in Chapter 6 goes some way to remedying this situation
...the more traditional top down searches
...spanning tree on the documents could be an effective structure for guiding a search for relevant documents
...4
...The three areas of research discussed so far could fruitfully be explored through a simulation model
...One major open problem is the simulation of relevance
...5
...This has been the most troublesome area in IR
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