id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ital-5767	Bookstein, Abraham	Statistical Behavior of Search Keys	1973-06-01	8	.pdf	application/pdf	3411	171	66	This model similarly assumes that among any sizeable number of requests, the fraction of the time any particular search key value will occur is fixed; thus, for any subset of search key values, it is possible to determine how often members of that subset will occur among a set of requests. For a particular collection, letS denote the set of search key values Statistical Behavior of Search Keysj BOOKSTEIN 111 for which, say, twenty or more items are retrieved.	cache/ital-5767.pdf	txt/ital-5767.txt