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Re: st: Comparing mean of two regression models
From
David Hoaglin <[email protected]>
To
[email protected]
Subject
Re: st: Comparing mean of two regression models
Date
Sun, 11 Dec 2011 08:15:11 -0500
What is the justification for fitting separate models when it would be
customary to make the comparisons between slopes and intercepts within
a single model (which would give a better estimate of the residual
variance)? You would estimate the difference in intercepts by
including dummy as a predictor, and the difference in slopes by
including the interaction that Joerg suggested earlier.
David Hoaglin
On Sun, Dec 11, 2011 at 3:11 AM, David Ashcraft
<[email protected]> wrote:
> Thanks a lot Joerg,
>
> It worked. Please advise, if I want to compare the intercepts rather than slopes than hat should I do?
> David
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