Calculates the Negative Binomial size parameter
s2 such that the variance of the distribution
mu2 and size
s2 is the same as the Negative Binomial distribution with mean
mu1 and size
s1. This can be useful when computing power for a Negative Binomial
distribution in the packages
size2.samevar(mu1, mu2, s1)
Negative Binomial mean for group 1
Negative Binomial mean for group 2
Negative Binomial size for group 1
The size for group 1.
Jon Barry: Jon.Barry@cefas.co.uk
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mu1=5; mu2=10; s1=3 s2 = size2.samevar(mu1, mu2, s1) s2 # Check variances are the same v1 = mu1 + mu1^2 / s1 v2 = mu2 + mu2^2 / s2 v1; v2
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