[R] lm regression

effeesse scarpino86 at gmail.com
Fri Nov 26 15:06:07 CET 2010

I found one error in in the code, however, I still receive errors. 

Error in storage.mode(y) <- "double" : 
  invalid to change the storage mode of a factor
Moreover: Warning message:
In model.response(mf, "numeric") :
  using type="numeric" with a factor response will be ignored

>From my understanding of the warning there are two errors, maybe they are
connected. I think I should change an option in the lm changing the responso
from "numeric" to "factor". Is it true? How it can be done? 
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