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Re: st: Margins for interactions terms


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Margins for interactions terms
Date   Mon, 9 Dec 2013 22:18:56 +0000

Good advice. It's a fair guess that this program needs more than minor
surgery to perform with -margins-.
Nick
njcoxstata@gmail.com


On 9 December 2013 21:19, Richard Williams
<richardwilliams.ndu@gmail.com> wrote:
> At 02:43 PM 12/9/2013, Nick Cox wrote:
>>
>> You asked a similar question before.
>>
>> http://www.stata.com/statalist/archive/2013-12/msg00300.html
>>
>> -reg2hdfe- is a user-written program from SSC, as you are asked to
>> explain. Evidently the author is not an active member of Statalist;
>> many users, naturally, are not.
>>
>> Adding code to return e(sample) is documented at -help ereturn-. You
>> would need to clone the program, find the appropriate place to add
>> code and take responsibility for what happens. Alternatively, try
>> emailing the author directly.
>
>
> Without even looking at the code I bet it is even more complicated than
> that. The program was written for Stata 9.1 which is pre-factor variable
> notation. So, my guess is that margins is not going to handle the
> interaction term correctly.
>
>
>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 9 December 2013 16:45, emanuele mazzini <madsoenistata@gmail.com>
>> wrote:
>> > Dear all,
>> >
>> > I am estimating a gravity model with exporter-year and importer-year
>> > FE with an interaction term  and the reg2hdfe command, as follows:
>> >
>> >
>> > reg2hdfe ln(trade_flow) ln(gdp_o) ln(gdp_d) ln(distance) x1 x2 x1*x2,
>> > id1(it) id2(it)
>> >
>> > where it and jt are defined as:
>> >
>> > egen it = group (iso_o year)
>> > egen jt = group (iso_d year)
>> >
>> > After I obtain the estimation results, I try to run the margins
>> > command as to obtain the marginal effect of x1 on the dependent
>> > variable lx and draw a marginsplot.
>> >
>> > Unfortunately, when I run -margins- Stata returns me the following
>> > error:
>> >
>> > e(sample) does not identify the estimation sample.
>> >
>> > which seems a bit strange to me, because -ereturn list- gives me the
>> > e(N)
>> > function.
>> >
>> > Anyone knows how to add the e(sample) to the list of functions that
>> > -reg2hdfe- returns?
>> >
>> > Thank you in advance,
>> >
>> > Regards,
>> >
>> > Emanuele.
>> > *
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>
>
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
> OFFICE: (574)631-6668, (574)631-6463
> HOME:   (574)289-5227
> EMAIL:  Richard.A.Williams.5@ND.Edu
> WWW:    http://www.nd.edu/~rwilliam
>
>
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