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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