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RE: st: Testing the extent of difference between two coefficients in the same model
From
Erik Aadland <[email protected]>
To
<[email protected]>
Subject
RE: st: Testing the extent of difference between two coefficients in the same model
Date
Wed, 1 Feb 2012 08:38:46 +0000
Thank you Maarten, David, Peter, Sami and Richard for your insight and suggestions.
I have tested both techniques (one-sided z-test and modifying the model) but will do some more testing before deciding on which one to apply.
I think I am leaning towards modifying the model.
Kind regards,
Erik.
> Date: Tue, 31 Jan 2012 12:34:22 +0100
> Subject: Re: st: Testing the extent of difference between two coefficients in the same model
> From: [email protected]
> To: [email protected]
>
> On Mon, Jan 30, 2012 at 11:12 PM, David Hoaglin wrote:
> > A model in
> > which the two coefficients are equal is the same as the model in which
> > the predictor associated with that coefficient is the sum of "old" and
> > "new."
>
> This is a trick that is often forgotten (at least in my discipline),
> but can have surprisingly useful applications beyond adding linear
> constraints to models that do not allow the -constraint- option. I
> submitted a Stata tip on this topic a couple of days ago.
> <http://www.maartenbuis.nl/wp/sumconstr.html>
>
> -- Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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