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...col(pwdiff[,abs(pwdiff[x,]>=t)]))/ncol(pwdiff))*100) I should add that my data has NAs in some rows and not others (but I do not want to just ignore rows that have NAs) Thanks! Paul -- View this message in context: http://r.789695.n4.nabble.com/counting-columns-that-fulfill-specific-criteria-tp3622265p3622265.html Sent from the R help mailing list archive at Nabble.com.