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From | Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Testing whether the average partial effects are statistically different across groups? |
Date | Wed, 31 Aug 2011 05:06:46 -0700 |
The above example extends simply by adding -xt- to -probit-: /**************************************/ webuse union, clear xtprobit union age grade not_smsa /// i.south##c.year margins, over(south) dydx(c.year) /// at(south=(0 1)) coeflegend post test _b[1bn._at#0bn.south]= _b[2._at#1.south] /**************************************/ T On Wed, Aug 31, 2011 at 4:13 AM, natasha agarwal <agarwana2@googlemail.com> wrote: > Thank you very much for your kind assistance. > > Can this also be performed after xtprobit, re? > > Thanks > Natasha > > On Wed, Aug 31, 2011 at 12:05 PM, Tirthankar Chakravarty > <tirthankar.chakravarty@gmail.com> wrote: >> Actually, I think what you want is something slightly different, in >> that you only want to compare the AME for group1 for the group1 >> subsample, with the AME for group2 for the group2 subsample. This can >> be had by decomposing the marginal effects as discussed in the manual >> entry [R] on -margins-, pg. 969-972. Which makes more sense depends on >> the nature of the "e" variable. >> >> /**************************************/ >> webuse union, clear >> probit union age grade not_smsa /// >> i.south##c.year >> margins, over(south) dydx(c.year) /// >> at(south=(0 1)) coeflegend post >> test _b[1bn._at#0bn.south]= _b[2._at#1.south] >> /**************************************/ >> >> T >> >> >> On Wed, Aug 31, 2011 at 3:49 AM, Tirthankar Chakravarty >> <tirthankar.chakravarty@gmail.com> wrote: >>> Create an indicator variable for your condition (i.e., a variable >>> which is 1 if e>=0.5, 0 else), interact it fully with the variable of >>> interest ("fdi"), compute -margins, over(indicator) dydx(fdi)-, that >>> is the average marginal effects of "fdi" over the values of the >>> indicator term, and test the values produced for equality, as in the >>> following example: >>> >>> /**************************************/ >>> webuse union, clear >>> probit union age grade not_smsa /// >>> i.south##c.year >>> margins, over(south) dydx(c.year) >>> test _b[0bn.south]=_b[1.south] >>> /**************************************/ >>> >>> T >>> >>> On Wed, Aug 31, 2011 at 3:35 AM, natasha agarwal >>> <agarwana2@googlemail.com> wrote: >>>> Hello Everyone, >>>> >>>> I was estimating the following model: >>>> >>>> probit expdum fdi if e>=0.50 >>>> margins, dydx(*) >>>> probit expdum fdi if e<0.50 >>>> margins, dydx(*) >>>> >>>> Now I wanted to know whether the estimated Average partial effects of >>>> fdi are statistically different across the two groups. >>>> >>>> Can anyone please help me with this? >>>> >>>> Many thanks >>>> Natasha >>>> * >>>> * 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/ >>>> >>> >>> >>> >>> -- >>> Tirthankar Chakravarty >>> tchakravarty@ucsd.edu >>> tirthankar.chakravarty@gmail.com >>> >> >> >> >> -- >> Tirthankar Chakravarty >> tchakravarty@ucsd.edu >> tirthankar.chakravarty@gmail.com >> >> * >> * 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/ > -- Tirthankar Chakravarty tchakravarty@ucsd.edu tirthankar.chakravarty@gmail.com * * 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/