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CHAPTER 7: CHOOSING A DISTRIBUTION
There are several fields related to the use of distributions in ABC Planner. The first column
contains a keyword establishing the distribution type (BETA, BINO, CONS, GAMM, EXPO,
NORM, POIS, TRIA, UNIF, WEIB). The last three fields are used to enter the parameters of the
distribution. Depending on the distribution type, 1, 2 or 3 parameters are necessary.
When some parameters are not required for a distribution, the related fields should be left to 0.
The default distribution is the CONS distribution, which necessitates only one parameter.
The following table describes the distributions defined in ABC Planner.
Distribution
GAMM – Gamma
Example
Parameters
A,B
Description
A >0
B is the scale, B >0
Domain: [0, ∝)
Mean: AB
Peek: A-1
CONS – Constant
EXPO – Exponential
C
M
Constant value, C
Mean: M
63% of values < M, 14% > 2M,
5% > 3M, 2% > 4M
Domain: [0, ∝)
Peek: 0
NORM – Normal
M,S
TRIA – Triangular
L,D,U
Mean: M
Standard deviation: S >0
68,7% of values between
M-S and M+S
95.5% of values between
M-2S and M+2S
Peek: M
Domain: (-∝, ∝)
Minimum (L), peek (D),
maximum (U)
Domain: [L, U]
Peek: D
ABC Planner – Version 2.0
Copyright 2004 -–MultiCIM Technologies Inc.
User’s Manual
64
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