beta_params | R Documentation |
Function to calculate the alpha and beta parameters of the Beta distribution
based on the method of moments using the mean \mu
and standard
deviation \sigma
of the random variable of interest.
beta_params(mean, sigma)
mean |
Mean of the random variable. |
sigma |
Standard deviation of the random variable (i.e., standar error). |
alpha Alpha parameter of beta distribution
beta Beta parameter of beta distribution
Based on methods of moments. If \mu
is the mean and
\sigma
is the standard deviation of the random variable, then
\alpha = (\frac{1-\mu}{\sigma^2} - \frac{1}{\mu}) \mu^2
and
\beta = \alpha (\frac{1}{\mu} -1)
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