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From | Nick Cox <njcoxstata@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Pesaran CD Test - The panel is highly unbalanced |
Date | Mon, 2 Jan 2012 01:37:01 +0000 |
Your claim of balance is contradicted by your own results which show varying group sizes and a number of observations much less than your N multiplied by your T. You refer to user-written -xtcd- and -xtcsd- without explaining that they are user-written or where they come from. The authors of these programs are not necessarily Statalist members, so if you do not get a more detailed answer, you may need to contact the authors directly for support. The last error message indicating that Stata can't find -sqrt()- will be a side-effect of some other problem. Stata does have a -sqrt()- function; the problem evidently lies in how it is called within one of the programs you are using, but I can't say more on how that arises. Please read the Statalist FAQ for advice on how to post questions. Nick On Mon, Jan 2, 2012 at 12:12 AM, Lim Boon Leong <lboonl@streamyx.com> wrote: > I have a balanced panel data set of N=191 and T=6 but when I performed the > pesaran CD test by using the following command in Stata12, > > . xtreg lbonus ownexr ownex2r ownex3r ceodual ined remcom1 exblock1 L.lmktbk > L.roa L.ret L.debt L.ltotasset i.year i.sector2, re > > . xtcd, pesaran abs show > > I got the error message r(2001): The panel is highly unbalance. Not enough > common observations across panel to perform Pesaran's test. > > I am quite puzzled as in the RE model, the followings are reported: > > Number of obs = 526, number of groups = 121, obs per group: min=1, avg=4.3, > max=5 > > Based on the above, my question is: Are 526 observations still insufficient > to carry out the Pesaran CD test? And may I know what ate the minimum > observations required for Pesaran test? > > For the other balanced panel data set with the same N(191) and T (6), when I > run the Pesaran Test I obtained the error message as shown below after the > following command: > > .xtreg lsalary ownexr ownex2r ownex3r L.ldiv ceodual ined remcom1 extblock1 > L.lmktbk L.roa L.ret L.debt L.ltotasset i.year, fe > > .xtcsd, pesaran abs > > unkown function*sqrt () r(133) > > From the error message does it mean that for this data set I have sufficient > common observations across panel to carry out Pesaran test but because of > the unknown function *sqrt - Stata could not carry out the test? May I know > how to solve this problem? > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/