[R-meta] Comparing dependent, overlapping correlation coefficients

Anna-Lena Schubert @nn@-len@@@chubert @ending from p@ychologie@uni-heidelberg@de
Fri Aug 10 16:20:58 CEST 2018

Dear all,

I want to run a meta-analysis that compares dependent, overlapping
correlation coefficients (i.e., I want to see if X correlates more
strongly with Y than it does with Z). I already ran a meta-analysis
separately for both of these correlations and would now like to compare
those two pooled effect sizes statistically. Confidence intervals of the
two correlations do not overlap (r1 = .18 [.12; .24]; r2 = .32 [.25;
.39]), but I wonder if there may be a more elegant way to compare these
correlations than just based on CIs.

I wonder, for example, if a factorial variable could be used to identify
those correlations in a "long" data format style, and if I could test
for a significant interaction between variable type (Y vs. Z) and the
correlation in a meta-analysis:

    Study    Variable    r
    1    Y    .20
    1    Z    .30
    2    Y    .34
    2    Z    .43

I would greatly appreciate if anyone could tell me if that's a good idea
or could recommend other approaches. Thanks in advance for any offers of


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