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Re: RE: Re:st: xtpcse - "no time periods are common to all panels"
From
Christopher Baum <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: RE: Re:st: xtpcse - "no time periods are common to all panels"
Date
Sat, 19 Nov 2011 09:23:51 -0500
<>
On Nov 19, 2011, at 2:33 AM, Nick wrote:
> First, -egen, total()- can work with an expression, so that
>
> egen howmany = total(1), by(year)
>
> would work and a new variable -iota- is not needed.
>
> Second, that in turn is another way of doing
>
> bysort year : gen howmany = _N
Good point. That is surely the easiest way to see where the assumption underlying xtpcse is failing.
Kit
Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
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