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st: Enquiry From PhD Student

From   Obi Berko <>
Subject   st: Enquiry From PhD Student
Date   Thu, 5 Mar 2009 12:08:51 -0800 (PST)


I found your e-mail on the web, when you provited an answer to some one

I am a PhD student and I have bought your book: Statistics with  Stata, Updated version 9

Please my problem is that I am working on a panel data of 12 year period starting from 1991 to 2002 and I am runing an independent sample t-test, but I want to limit my output to 2002.. However my sata 9.2 version tells me option not required when I type my command.

Here is is how I typed the command:

ttest, capital, by(exports) unequal level(95) if wave==12

the 12 means 2002, but results window tells me "option not required". Please if I want to run an independent sample t-test with a panel data and I want to limit it to a particular wave please what command should I use?


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