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RE: st: RE: Statistical test comparing two nonindependent variances?
Thank you. Very helpful. I screwed up and accidently included RE in the
original subject line.
Brad Anderson
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Austin Nichols
Sent: Friday, April 14, 2006 12:26 PM
To: [email protected]
Subject: Re: st: RE: Statistical test comparing two nonindependent
variances?
The RE: in the subject line seems to suggest this a reply to
something, but it's not clear what...
maybe this Q was already answered, but here goes, anyway...
. help sdtest
and -findit compare variance- would find that and sbe33
(commands implementing the Bland-Altman approach to comparing
two or more measurement methods; also alternative command to
sdtest based on Pitman's method giving confidence intervals
for variance ratios of paired data)
On 4/14/06, Anderson, Bradley J <[email protected]> wrote:
> A colleague wants to test the hypothesis that the variance of X1 is not
> equal to the variance of X2. X1 and X2 are measured on the same scale of
> measurement in the same sample. I know of the F-test for comparing two
> variances from independent samples, but can't seem to come up with
anything
> that is appropriate in this case. Perhaps I'm just ignorant. Thanks!
>
> Brad Anderson
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