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Hello, I get the following prompt when tring to compute rlm: > x<-rlm(core.e, na.action=na.omit) >Error in qr(x) : NA/NaN/Inf in foreign function call (arg 1) I checked with is.finite and is.infinite but in both cases i get FALSE and my missing values are substituted by NA. what does this error prompt mean and how do I solve it? thanks in advance, cheers Martin -- Martin