Using JMP - SAS

Appendix B Formula Functions Reference 423
Probability Functions
The Weibull distribution has two parameters, α >0 and β >0. When β = 1 the pdf reduces to the
exponential distribution (with γ =1/β). The exponential distribution is a special case of both the gamma
and Weibull distributions. However, there are Weibull distributions that are not exponential distributions.
Weibull Quantile
Accepts a probability argument p, and returns the p th quantile from the Weibull distribution with the shape
and scale parameters that you specify. The Weibull Quantile function is the inverse of the Weibull
Distribution function.
Johnson Su Distribution
Returns the probability that a Johnson Su-distributed random variable is less than x.
Johnson Su Quantile
Returns the quantile whose value for which the probability is p that a random value would be lower.
Johnson Su Density
Returns the density at x of a Johnson Su distribution.
Johnson Sb Distribution
Returns the probability that a Johnson Sb-distributed random variable is less than x.
Johnson Sb Quantile
Returns the quantile whose value for which the probability is p that a random value would be lower.
Johnson Sb Density
Returns the density at x of a Johnson Sb distribution.
Johnson Sl Distribution
Returns the probability that a Johnson Sl-distributed random variable is less than x.
Johnson Sl Quantile
Returns the quantile whose value for which the probability is p that a random value would be lower.
Johnson Sl Density
Returns the density at x of a Johnson Sl distribution.