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Re: st: xtunitroot ips error for 'no observations' and trend

From   Scott Merryman <>
Subject   Re: st: xtunitroot ips error for 'no observations' and trend
Date   Sun, 19 Sep 2010 13:11:49 -0500

1.  Try -set trace on- to see where the problem is located.

2.  To test if the series is trend stationary.


On Fri, Sep 17, 2010 at 7:08 PM, wangpan110 <> wrote:
> Hi, i am new to STATA and running an unbalanced panel. i am wondering ask two
> questions:
> 1) when i use -xtunitroot ips- to examine the variable's stationarity, some
> variables display 'no obserevations, e (2000)', i have tried -xtunitroot
> fisher- and the same problem comes again, what can i do? it seems not beause
> of lots of missing values in each panel.
> 2) what is exacatelly meaning of -trend- commonand following up -xtunitroot
> ips-? becuase the P-value are substainally different between with -trend-
> and without -trend-.
> any help is appreciated.
> Pan
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