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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Tue, 1 Jun 2010 23:39:52 +0200 |

<> 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/

**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>

**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>

**st: 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>

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