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

From   wangpan110 <>
Subject   st: xtunitroot ips error for 'no observations' and trend
Date   Fri, 17 Sep 2010 17:08:22 -0700 (PDT)

Hi, i am new to STATA and running an unbalanced panel. i am wondering ask two

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.

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