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I'm not sure what formula it uses, but I've used this web page in the past: http://www.quantitativeskills.com/sisa/statistics/correl.htm J 2008/12/29 Ioanna Vrouva <[log in to unmask]>: > Dear All, > Can anybody send me the formula for performing a statistical test to compare > two (related) correlation coefficients, i.e. r(x,y) with r(x,z) > I thought that the Hotelling's t test was appropriate but according to the > abstract below, it may not be the case. > Any advice would be greatly appreciated. > Besides this, have a very happy new year. > Ioanna > > > > Comparing correlated correlation coefficients > XIAO-LI MENG ; ROSENTHAL R. ; RUBIN D. B. ; > Psychological Bulletin, 1992, V vol. 111, n.1, pp. 172-175 (11 ref.) > > > Abstract > The purpose of this article is to provide simple but accurate methods for > comparing correlation coefficients between a dependent variable and a set of > independent variables. The methods are simple extensions of Dunn & Clark's > (1969) work using the Fisher z transformation and include a test and > confidence interval for comparing two correlated correlations, a test for > heterogeneity, and a test and confidence interval for a contrast among k > (>2) correlated correlations. Also briefly discussed is why the traditional > Hotelling's t test for comparing correlated correlations is generally not > appropriate in practice. > -- Jeremy Miles Learning statistics blog: www.jeremymiles.co.uk/learningstats Psychology Research Methods Wiki: www.researchmethodsinpsychology.com