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Beta distribution
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==Normal approximation to the Beta distribution== A beta distribution <math>\Beta(\alpha,\beta)</math> with ''α'' ~ ''β'' and ''α'' and ''β'' >> 1 is approximately normal with mean 1/2 and variance 1/(4(2''α'' + 1)). If ''α'' ≥ ''β'' the normal approximation can be improved by taking the cube-root of the logarithm of the reciprocal of <math>\Beta(\alpha,\beta)</math><ref>On normalizing the incomplete beta-function for fitting to dose-response curves M.E. Wise Biometrika vol 47, No. 1/2, June 1960, pp. 173–175</ref>
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