PsiTriangular Distribution

PsiTriangular (a,c,b,...)

PsiTriangular (a,c,b) is a distribution with lower bound a, upper bound b, and most likely value c.  This distribution is usually used to create rough models in situations where little or no data is available.  If the parameter c = b, then the distribution is also known as a Right Triangular distribution.  If the parameter c = a, then the distribution is also known as a Left Triangular distribution. If X1 and X2 are independent Uniform (0,1) random variables, then (X1+X2)/2 has a Triangular (0,0.5,1) distribution.

Alternate Formulation:  PsiTriangularAlt

The alternative parameters are combinations of the native arguments (min, likely, max) plus percentiles, i.e. =PsiTriangularAlt(min, percentile1, percentile2), PsiTriangularAlt(percentile1, likely, percentile2), etc.