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From |
"Guillaume Frechette" <gurst1@hotmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: mfx compute, predict(pu0) after xtprobit |

Date |
Tue, 16 Dec 2003 18:21:56 +0000 |

Thanks a lot May, very helpful. I guess I am still learning how to read the help files.

Cheers,

g

_________________________________________________________________From: May Boggess <mboggess@stata.com> Reply-To: statalist@hsphsun2.harvard.edu To: statalist@hsphsun2.harvard.edu Subject: Re: st: mfx compute, predict(pu0) after xtprobit Date: 16 Dec 2003 07:31:41 -0600 On Monday, Guillaume Frechette wrote: > Does someone know what mfx compute without any options reports? > And, is it just me or the pu0 option is not very well documented in > the Stata Help (I mean not using the books)? In the -mfx- help file it says: By default, mfx calculates the marginal effects or elasticities at the means of the independent variables by the default prediction option associated with the preceding estimation command. So, you have to look at the help file of the estimation command you are using, and in Guillaume's case that's -xtprobit-, to see what is the default for -predict-. For a lot of commands it's xb, so using -mfx- without an option is then the long way of getting you coefficients back again! Let's look to see what it says in the help file for -xtprobit-: Options for predict xb calculates the linear prediction. This is the default for the random-effects model. ... mu and rate both calculate the predicted probability of depvar. mu takes into account the offset(). rate ignores those adjustments. mu and rate are equivalent if you did not specify offset(). mu is the default for the population-averaged model. So, Guillaume definitely needs to use the option -predict(pu0)- with -mfx compute-. yours, May -- mboggess@stata.com * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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