Exponentiated_Weibull_distribution
In statistics, the exponentiated Weibull family of probability distributions was introduced by Mudholkar and Srivastava (1993) as an extension of the Weibull family obtained by adding a second shape parameter.
The cumulative distribution function for the exponentiated Weibull distribution is
for x > 0, and F(x; k; λ; α) = 0 for x < 0. Here k > 0 is the first shape parameter, α > 0 is the second shape parameter and λ > 0 is the scale parameter of the distribution.
The density is
There are two important special cases:
- α = 1 gives the Weibull distribution;
- k = 1 gives the exponentiated exponential distribution.