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Re: st: T-testing with Confounding Variables?


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: T-testing with Confounding Variables?
Date   Mon, 24 Feb 2014 13:54:33 -0500

this is called regression; for a quick example of the relationship
between t-test and regression, try the following:

sysuse auto
ttest gear, by(foreign)
regress gear foreign

you will see that the constant in the regression matches the mean for
foreign=0 while the coefficient for foreign matches the difference from
the t-test; since I did not include anything about the possibly unequal
variances, you will see that the p-values also match (the two-sided
p-value from the t-test matches that in the regression)

Rich

On 2/24/14, 1:46 PM, Charles Christian wrote:
> Is there a way to t-test data (e.g., salary by gender), where there
> are confounding variables one wants to control for (e.g., department,
> location)?
> 
> Thank you!
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