Re: Estimating r^2 from F ratio
From: Richard Ulrich (Rich.Ulrich_at_comcast.net)
Date: 03/26/05
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Date: Sat, 26 Mar 2005 00:11:35 -0500
On Fri, 25 Mar 2005 23:11:15 EST, skeptic8000 <iswear99@Hotmail.com>
wrote:
"Is there a quick, relatively easy calculation that one can use to
approximate an r squared value when all you are given is F ratio and
the degree of freedoms (i.e. within and between subjects df's are
known)? If so could you provide me with the formula and derivation? "
The formula for F is exact -
F = (R^2/Num) / ((1-R^2)/Denom)
So you can rearrange that to solve for R^2.
Or try out values with your known d.f.'s for numerator
and denominator.
-- Rich Ulrich, wpilib@pitt.edu http://www.pitt.edu/~wpilib/index.html
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