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Distribution Types

	Value	Scale Parameter
Normal	mean	COV
Log-Normal	median	COV ~ s_{ln x}
Uniform	mean	scale factor
Gumbell	characteristic value	scale factor
Weibull	characteristic value	Weibull slope
None
Computed

The scale factor for the uniform distribution is used to compute the maximum and minimum value. Minimum value = ( 1 - Scale factor ) * ( mean ) and Maximum value = ( 1 + Scale Factor ) * mean

If you enter a value of zero for either the normal or the uniform distribution types, you should enter the standard deviation for the scale parameter. This allows you to generate a distribution around zero.

A None distribution is the same as a constant value and the scale parameter is ignored.

The computed distribution type is a "pseudo-distribution type". It will generate a distribution based on each set of input variables. For example, if the computed distribution type is selected for x and the default value is x = y/z, then after values for y and z are generated according to their respective distributions, the values for x will be calculated by division. The scale parameter is ignored for this distribution.

For for information, please see the Statistical Distributions Technical Background.