ISR10 The Query-Document Matching Function chapter Joseph John Rocchio Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 4-45 attractive as the collection size incr[OCRerr]ases on two counts: first,. because a lar[OCRerr]er collection shoul[OCRerr] lead to. better defined cate[OCRerr]ories, and second, because the ratio of comparisons re[OCRerr]uired with classification to the number required with a full search is a decreasin[OCRerr] function of :[OCRerr]