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Dear all, I've tried a multiple regression, and now I want to try a cross-validation. I obtain this error (it must be sth related to df) that I don't understand, any help would be appreciated. cv.lm(df= dat, lm2.52f, m=3) Error en `[.data.frame`(df, , ynam) : undefined columns selected lm2.52f is my lm object, dat is a dataframe where the variables involved in .lm are I tried CVlm also but the same error Thanks, user at host.com -- View this message in context: http://r.789695.n4.nabble.com/cv-lm-syntax-error-tp3334889p3334889.html Sent from t...