






Hi, 

> Is the variable st character or a factor? What does str(train$st) show?

> str(train$st)
 Factor w/ 208 levels "0,0000000","0,0058643",..: 132 134 41 29 42 151 195 195 196 207 ...

Thank you very much Max with your help I found my error, now it works.

Marlene.

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