comparing R square values of two regressions?

Posted by Daniel Miller-3 on Nov 14, 2006; 12:56am
URL: http://spssx-discussion.165.s1.nabble.com/comparing-R-square-values-of-two-regressions-tp1072089.html

Hi,

maybe someone can help me with this problem. I calculated two linear
regressions over the same variables but for two groups (boys and girls).
Now, i would like to compare the two R square values to see which model
explains more variance. Descriptivley the R square value of the one group
(boys) is higher than the R square value of the other group. Is it sound to
compare these two values like this? If so, how could I show that the
difference between the two R square values is significant?

Thanks a lot for your help,
Dan

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