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st: unit root test for panel data

From   "Ping Zheng" <>
To   <>
Subject   st: unit root test for panel data
Date   Tue, 20 Sep 2005 10:39:15 +0100

By following the suggestions from the people, tsset has been done
firstly, then I've tried several ways to do unit root test but
unsuccessful (please see below). what is the commands for dfuller test?
I've also tried "levinlin", "ipshin", but didn't work either.

Many thanks for your help

 tsset id year, yearly
       panel variable:  id, 1 to 28
        time variable:  year, 1984 to 2002
. edit
- preserve
. dfuller
varlist required
. dfuller  lfdi lex lim
too many variables specified
. dfuller lfdi
sample may not include multiple panels
. dfuller lfdi lex
too many variables specified
. edit
- preserve
. update query
connection timed out -- see help r(2) for troubleshooting did not respond or is not a valid update site
. update
Stata executable
    folder:               L:\win32apps\stata9\
    name of file:         wsestata.exe
    currently installed:  22 Apr 2005
Ado-file updates
    folder:               L:\win32apps\stata9\ado\updates\
    names of files:       (various)
    currently installed:  04 May 2005
    Type -update query- to compare these dates with what is available
Click to edit automatic update checking preferences
. levinlin
unrecognized command:  levinlin
. ipshin
unrecognized command:  ipshin
. madfuller
unrecognized command:  madfuller

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