 Dataplot Vol 2 Vol 1

# LDECDF

Name:
LDECDF (LET)
Type:
Library Function
Purpose:
Compute the standard form of the log double exponential (also known as the log Laplace distribution) cumulative distribution function.
Description:
The standard form of the log double exponential distribution has the following cumulative distribution function: The input value can be any real number.
Syntax:
LET <y> = LDECDF(<x>,<alpha>)
<SUBSET/EXCEPT/FOR qualification>
where <x> is a variable, a number, or a parameter;
<y> is a variable or a parameter (depending on what <x> is) where the computed log double exponential cdf value is saved;
<alpha> is a variable, a number, or a parameter that specifies the shape parameter;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.
Examples:
LET A = LDECDF(3,2)
LET A = LDECDF(A1,1.5)
LET X2 = LDECDF(X1,0.5)
Note:
The general form of the log double exponential distribution is: The parameter is a location parameter and the parameter is a positive scale parameter.

Default:
None
Synonyms:
None
Related Commands:
 LDEPDF = Compute the double exponential probability density function. LDEPPF = Compute the double exponential percent point function. DEXPDF = Compute the double exponential cumulative distribution function. EXPPDF = Compute the exponential cumulative distribution function. WEIPDF = Compute the Weibull cumulative distribution function. EV1PDF = Compute the extreme value type I cumulative distribution function. CHSPDF = Compute the chi-square cumulative distribution function.
Reference:
"Continuous Univariate Distributions: Volume 2", 2nd Ed., Johnson, Kotz, and Balakrishnan, John Wiley, 1994, page 192.
Applications:
Distributional Modeling
Implementation Date:
2001/10
Program:
```    MULTIPLOT 2 2
MULTIPLOT CORNER COORDINATES 5 5 95 95
TITLE AUTOMATIC
PLOT LDECDF(X,0.5)  FOR X = 0.01 0.01 5
PLOT LDECDF(X,1)  FOR X = 0.01 0.01 5
PLOT LDECDF(X,2)  FOR X = 0.01 0.01 5
PLOT LDECDF(X,5)  FOR X = 0.01 0.01 5
END OF MULTIPLOT
``` Date created: 10/9/2001
Last updated: 4/4/2003