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From |
Nirina F <fstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: what does it mean the default for -mfx- is discrete when it is evaluated at the mean? |

Date |
Wed, 2 Jun 2010 22:18:00 -0400 |

Thank you very much for the responses. May be : What you mean is that the rest of the variables are evaluated at the mean but the independent dummy variable is evaluated at the value 1 (instead of for example the mean at .37) Nirina On Tue, Jun 1, 2010 at 5:39 PM, Martin Weiss <martin.weiss1@gmx.de> wrote: > > <> > > This was a knee-jerk reaction of course, since in a linear regression the > marginal effects would always be constant. > > Still, what is the problem with saying that the marginal effect displayed is > for going from zero to one, i.e. the only move that a dummy can possibly > make? The fact that the share of ones in your sample is 37% does not change > this fact, does it? > > > HTH > Martin > > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss > Sent: Dienstag, 1. Juni 2010 23:27 > To: statalist@hsphsun2.harvard.edu > Subject: st: RE: what does it mean the default for -mfx- is discrete when it > is evaluated at the mean? > > > <> > > The point of evaluation does not seem to matter at all in this code, though: > > > *********** > sysuse auto, clear > reg price weight length foreign > mfx compute, dydx at(mean foreign=0) > mfx compute, dydx at(mean foreign=1) > mfx compute, dydx at(mean foreign=.2) > mfx compute, dydx at(mean foreign=.5) > mfx compute, dydx at(mean foreign=.8) > *********** > > > HTH > Martin > > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nirina F > Sent: Dienstag, 1. Juni 2010 16:09 > To: statalist@hsphsun2.harvard.edu > Subject: st: what does it mean the default for -mfx- is discrete when it is > evaluated at the mean? > > Hello, > I have a dummy for dependent and main independent variable. I am using > ivprobit. > When I try to get the marginal effects, mfx shows you that the > default setting is 'discrete', that is, evaluate the marginal effect > of a dummy going from 0->1. But it is evaluated at the mean (and under > x it shows 0.37 for the independent variable) so I am a little bit > confused about the interpretation of the marginal effect. > Thank you for your help. > Nirina > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: RE: what does it mean the default for -mfx- is discrete when it is evaluated at the mean?***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**RE: st: RE: RE: what does it mean the default for -mfx- is discrete when it is evaluated at the mean?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**References**:**st: what does it mean the default for -mfx- is discrete when it is evaluated at the mean?***From:*Nirina F <fstata@gmail.com>

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