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After Character Conversion: litwin, witold (1980). linear hashing: a new tool for file and table addressing, linear hashing is a hashing in which the address space may grow and shrink dynamically. a file or table may then support any number of insertions and deletions without access or memory load performance deterioration ... After Word Extraction: litwin wit old linear hashing a new tool for file and table addressing linear hashing is a hashing in which the address space may grow and shrink dynamically a file or table may then support any number of insertions and deletions without access or memory load performance deterioration ...

1. e. ,. r - i - 1. e. S - h 2: O. ,. ,. ,. + 1) < h > h. r ranks. As mentioned before, it is assumed that all these ( ~: ) possibilities are equiprobable. The event Ah denotes a selection where h relevant documents are distributed among the ranks r, ... 8 - h relevant documents are distributed among the remaining ranks i + 1, ... r - 1. 8- h possibilities. 20) h=ho hI E[7r;J h=ho The computation of the functions IIq is straightforward: IIq(p) := max{E[7r;J I E[Pi] 2: plĀ· The final recall function is obtained by averaging as shown before.

3) # docs dj E D;el containing 'Pi )_ docs dj E D;el not containing 'Pi # docs dj E D~on containing 'Pi ). 4) 42 CHAPTER 2 It can be shown that better estimates are obtained if a constant, say 1/2, is added to both the numerator and the denominator. 5) In the case where no relevance information is available, the assumption that all documents are irrelevant yields a reasonable estimation because there are usually many more irrelevant than relevant documents. This assumption corresponds to D;el = 0 and D~on = D.

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ACTUALTESTS ORACLE 1Z0-301 EXAMCHEATSHEET V10 14 04


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