[R] help with regression

[JoeP]

Hi,

I am trying to do a linear regression but I want one of my variables to not
generate a coefficient.  E.g. what I want to do is fit for y=a+b+c but
forcing the coefficient of b to be 1.  Is this possible?  

I have been fitting y-b=a+c but I have found that when I recalculate y it is
not close to the value.  I have assumed that by fitting y-b then the y part
has become insignificant.  In case it makes a difference I have been using
lm rather than glm.

Thanks in advance,

Joe

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