Description Usage Arguments Details Value See Also Examples
The function to_shape_rate_gamma
converts the mean and standard deviation to the shape and rate
1 | to_shape_rate_gamma(mu, sd)
|
mu |
a numeric vector representing the means of gamma distributions |
sd |
a numeric vector representing the standard deviations of gamma distributions.
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The purpose of this function is to convert the parameterization of gamma distribution in the form of mean and standard deviation to the form of shape and rate. It can be used for specifying the initial values for the EM algorithm when the first-hand initial values are in the form of mean and standard deviation from K-means clustering algorithm.
a list of two items
alpha |
a vector of the shapes of gamma distributions |
lambda |
a vector of the rates of gamma distributions |
1 2 | to_shape_rate_gamma(2, 1)
to_shape_rate_gamma(c(2, 4), c(1, 1))
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