ISR10 Search Request Formulation 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. is a function of the relevant ana' nonrelevant partition classes of [OCRerr]. [OCRerr]hus C may be written as: C = an& therefore the vector q0 which maximizes C is: q0 = ka or: =k [[OCRerr]n1o; 1[OCRerr]1 ([OCRerr].5) - Id-[OCRerr] m[OCRerr]n[OCRerr] [OCRerr] DR 1 with k bei[OCRerr] an arbitrary scalar. TWQ observations can be arawn from the result. First, if the vector sumations are taken over two arbitrary subsets, say R an[OCRerr] S, resultin[OCRerr] in: kFl[OCRerr]ri -1 (3.6) = [OCRerr] n 0 Ln1[OCRerr]Ir[OCRerr]j 2/[OCRerr]t-s[OCRerr]Ij 1 1 where n1 = n(R) an[OCRerr] n2 = n(s); then q[OCRerr] is that vector which maximizes 0 the [OCRerr]ifference between the mean of its correlations with the members