Dataplot Vol 2 Vol 1

# IWEPPF

Name:
IWEPPF (LET)
Type:
Library Function
Purpose:
Compute the standard form of the inverted Weibull percent point function with tail length parameter .
Description:
The standard form of the inverted Weibull percent point function is:

Syntax:
LET <y> = IWEPPF(<p>,<GAMMA>)             <SUBSET/EXCEPT/FOR qualification> where <p> is a variable, number, or parameter;
<y> is a variable or a parameter (depending on what <p> is) where the computed inverted Weibull ppf value is stored;
<GAMMA> is a positive number or parameter that specifies the tail length parameter; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
Examples:
LET A = IWEPPF(0.9,2)
LET A = IWEPPF(A1,4)
LET X2 = IWEPPF(P,8)
Default:
None
Synonyms:
None
Related Commands:
 IWECDF = Compute the inverted Weibull cumulative distribution function. IWEPDF = Compute the inverted Weibull probability density function. WEIPDF = Compute the Weibull probability density function. GAMPDF = Compute the gamma probability density function. CHSPDF = Compute the chi-square probability density function. NORPDF = Compute the normal probability density function. LOGPDF = Compute the lognormal probability density function. PPCC PLOT = Generate a PPCC plot. PROBABILITY PLOT = Generate a probability plot. RANDOM NUMBERS = Generate random numbers.
Reference:
"Continuous Univariate Distributions: Volume 1", 2nd. Ed., Johnson, Kotz, and Balakrishnan, 1994, John Wiley, pp. 693.
Applications:
Reliability Analysis
Implementation Date:
2001/10
Program:
```    MULTIPOT 2 2
MULTIPLOT CORNER COORDINATES 5 5 95 95
MULTIPLOT SCALE FACTOR 2
Y1LABEL X
Y1LABEL DISPLACEMENT 12
X1LABEL P
TITLE IWEPPF (GAMMA = 0.5)
PLOT IWEPPF(P,0.5) FOR P = 0.01 0.01 0.99
TITLE IWEPPF (GAMMA = 1)
PLOT IWEPPF(P,1) FOR P = 0.01 0.01 0.99
TITLE IWEPPF (GAMMA = 2)
PLOT IWEPPF(P,2) FOR P = 0.01 0.01 0.99
TITLE IWEPPF (GAMMA = 5)
PLOT IWEPPF(P,5) FOR P = 0.01 0.01 0.99
END OF MULTIPLOT
```

Date created: 10/9/2001
Last updated: 4/4/2003
Please email comments on this WWW page to alan.heckert@nist.gov.