Description Usage Arguments Value Details
Function to calculate the alpha and beta parameters of the beta distribution based on the method of moments using the mean μ and standard deviation σ of the random variable of interest.
1 |
mean |
mean of the random variable. |
sigma |
standard deviation of the random variable (i.e., standard error). |
a list containing the following:
alpha The method-of-moments estimate for the alpha parameter of the beta distribution
beta The method-of-moments estimate for the beta parameter of the beta distribution
Based on methods of moments. If μ is the mean and σ is the standard deviation of the random variable, then
α = (\frac{1-μ}{σ^2} - \frac{1}{μ}) μ^2
and
β = α (\frac{1}{μ} -1)
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