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Specify model with polynomial interaction terms up to degree n

YTP 
Hi Rui, 

Thanks for responding. I did not write "raw=raw", and I'm not sure why R
would return such a misleading error message. Indeed, the same error message
comes up when I run the 2nd part of your code:
Error in poly(dots[[1L]], degree, raw = raw) : 
  'degree' must be less than number of unique points

However I can think of a workaround for this, and I get the main idea from
your example, which does exactly what I was hoping for, thanks very much!

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