st: e(sample) with reg2hdfe

[emanuele mazzini <madsoenistata@gmail.com>]

Dear all Statalist users,

I know that probably the same question has been discussed here:

http://www.stata.com/statalist/archive/2013-01/msg01324.html

but, still, although I am using the suggested command , I cannot solve
the problem relative to the fact that reg2hdfe does not return the
"e(sample)" function.

Specifically, I am trying to use the post-estimation command margins
after the following regression ran with reg2hdfe:

reg2hdfe lx RHS, id1(it) id2(jt)

The point is that, when I try to run margins, Stata returns me the
following error:

e(sample) does not identify the estimation sample.

I do not understand why, since with ereturn list I can obtain the e(N)
function.

Anyone knows how to solve this issue?

Thanks to all of you in advance,

Emanuele.
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