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st: Re: Predicted value and dummy explantory variables


From   Friedrich Huebler <huebler@rocketmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: Predicted value and dummy explantory variables
Date   Tue, 15 Mar 2005 07:06:10 -0800 (PST)

Clive,

-mfx- calculates the marginal effects at the mean values of the
independent variables. Evaluating a male-female dummy variable at its
mean is therefore not as unusual as you think.

Friedrich Huebler

--- Clive Nicholas <Clive.Nicholas@newcastle.ac.uk> wrote:
> Dawat Lidia wrote:
> 
> > I am estimating OLS regression model. From this I was trying to
> > estimate the
> > predicted value holding regressors at their mean value. But I am
> > not clear
> > if I can also hold dummy regressors at their means value. Is it
> > justifiable
> > to put dummy explantory variables at their mean value and obtain
> > the predicted value ?
> 
> No, it isn't: how can it be? If your dummy variable is gender, how
> can it
> possibly make sense to estimate the effect of being 0.47 of a male
> on whatever the response of interest is?
> 
> A quick solution to your problem is to pop along to -whelp adjust-.
> There
> you'll find that you can hold your continuous predictor and
> covariate
> variables at their means (if you desire), whilst setting your
> dummies at 0 or 1 (or both, if you choose to -adjust- twice).
> 
> CLIVE NICHOLAS        |t: 0(044)7903 397793
> Politics              |e: clive.nicholas@ncl.ac.uk
> Newcastle University  |http://www.ncl.ac.uk/geps



		
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