Rockwell Automation Arena Basic Edition Users Guide - Manual (Page 66)

A RENA B ASIC E DITION U SER ’ S G UIDE
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To enter a distribution in an Arena field, you type the name of the distribution (or its four-
letter abbreviation) followed by its parameters enclosed in parentheses. You may use
spaces around punctuation to help read the distribution. A few examples appear below.
UNIF( 3.5, 6 )
Uniform distribution with a minimum value of 3.5, a maximum value of 6
NORMAL(83, 12.8)
Normal distribution with a mean of 83, a standard deviation of 12.8
DISCRETE(0.3,50,0.75,80, 1.0,100)
Discrete probability distribution that will return a value of 50 with probability 0.3, a
value of 80 with cumulative probability 0.75, and a value of 100 with cumulative
probability of 1.0. (See “Discrete probability” for a description of these parameters.)
TRIA( 10, 15, 22)
Triangular distribution with a minimum value of 10, mode (most likely value) of 15,
and maximum value of 22
In the following pages, we provide a summary of each of the distributions supported by
Arena, listed in alphabetical order for easy reference. Each includes the density or mass
function, parameters, range, mean, variance, and typical applications for the distribution.
If you have existing data and want to select the appropriate distribution for use in your
model, use Arena’s Input Analyzer. Click on Tools > Input Analyzer to launch the
program, or launch it from the Windows Start menu.