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Critical Values for Bivariate Student t-Tests

Critical Values for Bivariate Student t-Tests

Journal of the American Statistical Association, 1969
Francois Steffens
Abstract
Let t1 and t12 be two independent normally distributed random variables with zero means and equal variances, each divided by a common estimate of the standard deviations. The joint distribution of t1, t2 is a bivariate Student t-distribution. The integral of the joint frequency function over certain types of critical regions in the (t1, t2)-plane may be written as the

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