Rev Language Reference

dnGamma - Gamma Distribution

Gamma probability distribution for positive real numbers.

Usage

dnGamma(RealPos shape, RealPos rate)

Arguments

shape : RealPos (pass by const reference)
The shape parameter.
rate : RealPos (pass by const reference)
The rate parameter (rate = 1/scale).

Domain Type

RealPos

Details

The gamma distribution is the probability of the sum of exponentially distributed variables. Thus, it provides a natural prior distribution for parameters that could be considered as sums of exponential variables.

Example

# lets simulate
a <- rgamma(1000,shape=4,rate=4)
# we expect a mean of 1
mean(a)

# create a random variable
x ~ dnGamma(shape=4,rate=1)
x

See Also

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