Accessory functions.
meanAL(mu, sigma, tau)
varAL(sigma, tau)
invvarAL(x, tau)location parameter.
scale parameter.
skewness parameter.
numeric value.
meanAL computes the mean of an asymmetric Laplace with parameters mu, sigma and tau.
varAL computes the variance of an asymmetric Laplace with parameters sigma and tau.
invvarAL computes the scale parameter of an asymmetric Laplace with parameter tau and variance x.
Yu K and Zhang J (2005). A three-parameter asymmetric Laplace distribution and its extension. Communications in Statistics-Theory and Methods 34, 1867--1879.