Hi,

I am a new R user. I am using it develop regression models with categorical
variables.
Is there a way to force some regression coefficients to be zero for some of
the values in a categorical variable (with 12 factor levels)?

I am recoding the values to the default value (1st in the order of dummy's).
But I am not sure if this is the correct approach if I want to force
coefficients to be specific values.

Thanks for your help.

Regards,
Danda

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