Re: [R] how to fix coefficients in regression

Hi, It is slightly clunky but: mod2 <- glm(Y ~ offset(I(1.3 * X1)) + X2, family = "binomial") should do the trick. See ?offset for details. Cheers, Josh On Thu, Jul 21, 2011 at 7:42 PM, Johan Jackson wrote: > Hello all, > > I am using a glm() and would like to fix one of the regression coef

[R] how to fix coefficients in regression

Hello all, I am using a glm() and would like to fix one of the regression coefficients to be a particular value and see what happens to the fit of the model. E.g.: mod1 <- glm(Y ~ X1 + X2,family='binomial') mod2 <- glm(Y~[fixed to 1.3]X1 + X2,family='binomial') The beta for X1 is freely estimate