Error in contrasts message when using logistic regression code.

How to change categorical vars to factors. 

There is nio such thing as a "categorical var" in R, although the closest thing to one is a factor class vector. If you have either numeric or character vectors and you want them to become factors:

facvar <- factor(oldvar)

I am very new at R

Yes. Consider abandoning Nabble. And do read the Posting Guide.

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