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st: help me please,about Stata

From   "[gb2312] С" <>
Subject   st: help me please,about Stata
Date   Sun, 27 Jul 2008 10:24:02 +0800

Dear Sir/Madam,

I am trying to do a test in stata using my panel dataset and I keep
getting the following message:
    i () required
    r (198)
    (the command line is xtreg lwage black exper, re)

Then I add the option i(<grp_year>) to the end of the command.(year means from 2001 to 2006),but no matter what I change, I keep getting that message.

Please help


Xiaogang He
Associate Professor and Associate Dean

School of International Business Administration
Shanghai University of Finance and Economics
777 GuoDing Road, Shanghai 200433, China

Tel: 86-21-65903670

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