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Re: st: lag length selection in unbalanced panel

From   Nick Cox <>
Subject   Re: st: lag length selection in unbalanced panel
Date   Tue, 27 Sep 2011 20:38:32 +0100

Impossible to say on this evidence. We need to see all your code. We
may need to know more about your data.


2011/9/27 spyridoula dimou <>:

> I am using an unbalanced panel, for which I want to perform the Fisher stationarity test. Therefore, I have to choose the appropriate number of lags to include. As the varsoc command does not work in panel data, I have tried to derive the optimal number of lags using the HQIC as proposed by
> When coming to perform my test, I copy the procedure proposed, changing the variable names and write
> xtfisher y, lag(`opt_lag').
> Then stata displays:
> option lag() incorrectly specified
> What is the mistake I make? When running the procedure using the
> everything works fine...

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