On Testing Equality of Related Correlation Coefficients
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Let ( X1 , X2 , X3 ) have a trivariate distribution with mean vector µ and covariance matrix Σ having ( i, j )th element σ ij = ρij σ i σ j with ρij = 1( i, j =1, 2, 3). If we are interested in testing the hypothesis H :ρ 12 =ρ 13 against appropriate alternatives under a variety of assumptions about the form of the trivariate distribution, but with no further restrictions on Σ, we could use one of the many asymptotic or conditional procedures that are available; see, for example, Aitkin, Nelson & Reinfurt (1968), Corsten (1970) and Dunn & Clark (1969). On the other hand, an exact, small-sample, unconditional test of H does not appear to be tractable for this general Σ. We show that by placing a mild restriction on Σ, such a small-sample test of H can be based on a simple, single product-moment correlation coefficient between the variables X1 and X3 − X2 provided that the conditional distribution of X1 given X3 − X2 , is normal.