Dear all,
 
I am back with another, perhaps very nooby, question.
Namely:
 
I have successfully extracted 3rd-degree regressions from my temperature data. My question is now, how can I find out the exact coefficient of those regressions' x^3 ? More exactly, (how) can I make a new series out of the regression coefficients for each year ?
 
Hoping I am being clear and thanks in advance,
 
Best to all,
 
Marc O'C.