Re: st: RE: marginal effects after Heckman

[Adri Bestazza <adribestazza@googlemail.com>]

Thank you for your help Barbro! In order to get unconditional marginal
effects, I used the mfx command. Yet, I noticed that the marginal
effects I found are identical to the coefficients for the outcome
equation, when the Heckman model is estimated by maximum likelihood.
I am confused: shouldn't the coefficients for the full equation's
variables be different from the corresponding marginal effects?
The fact that the "Betas" for the OLS part of the Heckman do not
correspond to elasticities should motivate the computation of marginal
effects...
Thanks in advance for any advice
Adri



On Wed, Mar 24, 2010 at 7:38 AM, Widerstedt Barbro
<Barbro.Widerstedt@tillvaxtanalys.se> wrote:
> This was useful to me:
> http://www.stata.com/support/faqs/stat/mfx_ologit.html
>
> /Barbro
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Adri Bestazza
> Sent: den 24 mars 2010 01:29
> To: statalist@hsphsun2.harvard.edu
> Subject: st: marginal effects after Heckman
>
> Hello
> After the estimation of a Heckman selection model, I need to compute
> the conditional and unconditional marginal effects. I was wondering if
> there are commands in Stata 10 that I could use to get these effects
> directly.
> Thanks,
> Adri
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