Rayleigh Distribution for the Probability Distribution Calculator

Density Function
The Rayleigh distribution has the probability density function:

f(x) = x/b2 * e^[-(x2/2b2)],    for 0 <= x < ∞, b > 0

where

b is the scale parameter
e is the base of the natural logarithm, sometimes called Euler's e (2.71...)
Distribution Function
The cumulative distribution function (the term was first introduced by Wilks, 1943) for the Rayleigh distribution is:

F(x) = 1 - e^[-(x2/2b2)]

R
This field displays the current variate value for the Rayleigh distribution. When you edit this value (either manually or with the microscrolls), Statistica computes the associated p-value for the specified scale parameter.
p
This field displays the p-value computed from the specified variate value and scale parameter or you can enter a desired p-value (either manually or edit the existing value with the microscrolls) and compute the critical value of the distribution for the specified parameter.
Scale
Specify here the scale parameter of the distribution, b. If this parameter is changed, then the p-value will be recomputed based on the respective variate value.