This simple function tests the null hypothesis that two variables are equally linearly correlated with a third variable when all three sets of observations were derived from the same "individuals" (i.e., a repeated measures/paired observations design). The test uses a t-distribution and was taken from:
Williams, E. J. (1959) The comparison of regression variables. Journal of the Royal Statistical Society: Series B, 21, 396-399.
It is one of the tests recommended for this situation by:
Steiger, J. H. (1980) Tests for comparing elements of a correlation matrix. Psychological Bulletin. 87(2), 245-251.
This function relies upon the MATLAB functions corr.m and cdf.m.
David Groppe (2021). r_test_paired (https://www.mathworks.com/matlabcentral/fileexchange/25984-r_test_paired), MATLAB Central File Exchange. Retrieved .
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