Rayleigh Distribution. The Rayleigh distribution has the probability density function:

f(x) = x/b2 * e-(x 2/2b2)
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...)

See also, Process Analysis.

The graphic above shows the changing shape of the Rayleigh distribution when the scale parameter equals 1, 2, and 3.
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