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From: Ryan on 10 Mar 2010 09:26
On Mar 9, 3:53 pm, lucy.c...(a)ASU.EDU (Lucy Chen) wrote:
> I run the same regression for two groups (group A vs group B).That is,
> Y = a1 + b1X (1)
> Y = a1 + b1X (2)
>
> where in equation (1), the regression is run in group A and in equation
> (2), the same regression is run in group B.
> I would like to test whether b1 in equation (1) is larger than b1 in
> equation (2). I know that I can use an interaction term b1*group A dummy
> to combine both groups. But if I cannot combine both groups, is there any
> formal test to test whether b1 in (1) is larger than b1 in (2)?
>
> I appreciate any help that you may provide.

Why can't you create a dummy variable?
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