Dear all,

I have been trying to  find a simple solution to my problem without success, though i have a feeling a simple syntaxe detail coul make the job.

I am doing a polynomial linear regression with 2 independent variables such as :

lm(A ~ B + I(B^2) + I(lB^3) + C, data=Dataset))

R return me a coefficient per independent variable, and I  would need the coefficient of the C parameter to equal 1. 


I've been loonking at "parameter constraints" on the  internet but it's always much more complicated that just "removing" the fit of a coefficient (or setting it to 1). 


I know many package allows to "not fit" an intercept with a "-1" parameter in the syntaxe, does that exists for independent variables ? 

Regards,
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