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Re: RE: Re:st: xtpcse - "no time periods are common to all panels"


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
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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