Compare the risk

thank you......

but it says "dfrm not found"

Of course it says, "dfrm not found". That's because it's on _my_  
workspace. You did not say what you were calling your dataframe and I  
cannot read your mind. I had to make up some name, and the chances  
that I would call it the same name as you did are pretty small.

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David Winsemius, MD
West Hartford, CT