At 12:01 PM 1/14/2004 -0500, Wandland, Kristen wrote:
Does anyone know a way to specify the difference in a ttest? The default
result is:
Ho = diff = 0
I hope to be able to do:
Ho = diff = #
where # is the standard deviation or other pre-determined value.
Thanks all.
A slightly clunky way: suppose you hypothesize the mean of X1 is 7 greater
than the mean of X2. Subtract 7 from X1 and do the t-test, e.g.
gen newx1 = x1 - 7
ttest newx1 = x2
It also wouldn't be too hard to do it by hand if this is just a one-shot
thing. Or, use the ttesti command, subtracting 7 from the mean of x1.
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