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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: st: xtpcse - "no time periods are common to all panels"
Date   Tue, 15 Nov 2011 17:55:39 -0500

<>

Most panels containing the same years is not the same as a time period being there for ALL panels, which is what is saying is not so. Try

. tabstat year, by(year) stat(N)

and see how many Ns in that list are equal to the number of panels in your data. For xtpcse to work, the number of years for which N = number of panels must be several if it is to compute a covariance matrix.

Kit

Kit Baum   |   Boston College Economics and 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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