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Re: st: ST: mfx output


From   Clive Nicholas <clivelists@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ST: mfx output
Date   Mon, 28 Sep 2009 07:57:23 +0100

Laura Platchkov wrote:

> I was just wondering how to interpret the mfx function, because I fail to find anotated output. In particular, how do I interpret the output when my independent variables is in logarithm form? And:

An increase of 1 unit in a logged RHS variable corresponds to a 100%
increase in its value, which in turn will be associated with an
increase of y units in your response variable.

> - Is the "y = fitted values (predict) " the predicted value for the dependent at the mean of
the sample?

Yes.

> -  what does the X stand for?

The mean value of each variable.

> - how do I do to compute the elasiticites?
>
>
>  mfx
>
> Marginal effects after regress
>      y  = Fitted values (predict)
>         =  6.6559795
> ------------------------------------------------------------------------------
> variable |      dy/dx    Std. Err.     z    P>|z|  [    95% C.I.   ]      X
> ---------+--------------------------------------------------------------------
> dtempwin |   .2421058      .24952    0.97   0.332  -.246949   .73116   .050837
> dtempspr |   .4376307       .2409    1.82   0.069  -.034528   .90979   .023661

[...]

The coefficients listed under dy/dx give you the marginal effects. To
calculate alternative elasticities, consult -help mfx-.

-- 
Clive Nicholas

[Please DO NOT mail me personally here, but at
<clivenicholas@hotmail.com>. Please respond to contributions I make in
a list thread here. Thanks!]

"My colleagues in the social sciences talk a great deal about
methodology. I prefer to call it style." -- Freeman J. Dyson.

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