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st: ask for help about ttesti


From   rghuang <0034058@fudan.edu.cn>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: ask for help about ttesti
Date   Sat, 13 Dec 2003 23:04:18 +0800

if i want to use
ttesti #obs1 #mean1 #sd1 #obs2 #mean2 #sd2 or ttesti #obs #mean #sd
but i just don't know what sd is,just know variance.how should i do?
do i have to use display to compute sd first?or still have some other ways?
thank you.



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