You want the offset function in the formula:
lm( A ~ B + I(B^2) + offset(C), data=Dataset)
This will force the coefficient on C to be 1, if you wanted a coefficient
of another value then just do the multiplication yourself, e.g. offset( 2 *
C ) for a slope of 2.
Also you can use poly(B,2) to fit
> -Original Message-
> 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.
Leavi
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