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Output4
Okay, this is a bit better, but it's still not possible to reproduce 
exactly what you are doing.  From what you've told me, all I can suggest 
is:
1. That you read the help page for whichever version of predict you were 
using (e.g. ?predict.lm)
2. See what types of input the model 'arv' needs.  Are they numeric?  How 
many of them should there be?
3. Try traceback(), to see exactly where the error occured
4. Set options(error=recover), and type the code that causes the error 
again.

Regards,
Richie.

Mathematical Sciences Unit
HSL


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