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st: AW: xtpcse regression

From   "Martin Weiss" <>
To   <>
Subject   st: AW: xtpcse regression
Date   Sun, 18 Jul 2010 12:04:56 +0200


You can check whether there is still a time period which has information on
all panels members like this:

webuse grunfeld, clear
set seed 34205
drop if runiform()<.2

//still a year there with 10 obs?
table year company, contents(freq) col
//so -xtpcse- still works
xtpcse invest mvalue kstock

drop if inlist(year,1942,1949,1951) & c==3
//still a year there with 10 obs?
table year company, contents(freq) col

//answer: "no"
cap xtpcse invest mvalue kstock
di in r "Error code: " _rc
//so -xtpcse- fails
//but works with the -pairwise- option:
xtpcse invest mvalue kstock, pairwise


-----Ursprüngliche Nachricht-----
[] Im Auftrag von Bin Dong
Gesendet: Sonntag, 18. Juli 2010 11:27
Betreff: st: xtpcse regression

Dear all,

Stata tell me "no common time periods between panels" when I run
xtpcse with my firm-year panel. Actually I have three kinds of firms
in my data set. For the first kind, I have 2003-2008 data, For the
second kind, I have 2003-2007 data. And for the third kind of firms, I
have 2004-2008 data. I am wondering why Stata thinks there are no
common time periods between panels even if I cut all 2003 and 2008
data. Is there anyone who has an idea about it? Thank you very much in

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