effect sized in paired t-test

[Larry Lutsky]

I am calculating effect sizes(e.s) for t-tests.  I know independent t-
tests e.s. can be calculated by correlating group membership (1 or 2) with
the dependent variable.  Alternately, Cohen's d can be calculated by hand
from the means and sd's.  Does anyone know the correct calculation of e.s.
with paired t-tests?  I can't find a clear answer on this question
anywhere.  Thanks in advance for your help.

[Alexander J. Shackman-2]

http://psyphz.psych.wisc.edu/%7Eshackman/mediation_moderation_resources.htm#Resources_for_Effect_Sizes

or, if you're willing to employ partial eta-sqr, re-run as a
repeated-measures glm

hth, ajs

On 7/12/07, Larry Lutsky <[hidden email]> wrote:
>
> I am calculating effect sizes(e.s) for t-tests.  I know independent t-
> tests e.s. can be calculated by correlating group membership (1 or 2) with
> the dependent variable.  Alternately, Cohen's d can be calculated by hand
> from the means and sd's.  Does anyone know the correct calculation of e.s.
> with paired t-tests?  I can't find a clear answer on this question
> anywhere.  Thanks in advance for your help.
>



--
Alexander J. Shackman
Laboratory for Affective Neuroscience
Waisman Laboratory for Brain Imaging & Behavior
University of Wisconsin-Madison
1202 West Johnson Street
Madison, Wisconsin 53706

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http://psyphz.psych.wisc.edu/~shackman