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Re: GLM and interactions
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From: |
Jason Stover |
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Subject: |
Re: GLM and interactions |
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Date: |
Thu, 7 Jul 2011 20:09:44 -0400 |
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User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Thu, Jul 07, 2011 at 04:09:28PM -0400, Jason Stover wrote:
> response = intercept + b_1 * X + b_2 * Y_1 + b_3 * Y_2 + b_4 * X * Y_1
> + b_5 * X * Y_2 + error
I forgot to mention: Notice the number of degrees of freedom
for the interaction is just the number of coefficients devoted
to that interaction.