But I read in the forum that cv.lm is not for multiple regression, that's why i change it ti CVlm, however i fell to the same error ....user at host.com -- View this message in context: http://r.789695.n4.nabble.com/cv-lm-syntax-error-tp3334889p3342333.html Sent from the R help mailing list archive at Nabble.com.