PA2PPF

PA2PPF (LET)

Library Function

Compute the Pareto percent point function of the second kind with shape parameters and a.

The standard form of the Pareto percent point function of the second kind is:

with and a. denoting the shape parameters. The a parameter is optional and has a default value of 1.

The Pareto distribution of the second kind is sometimes referred to as the Lomax distribution.

LET <y> = PA2PPF(<p>,<gamma>,<a>,<loc>,<scale>)
                        <SUBSET/EXCEPT/FOR qualification>
where <p> is a variable, a number, or a parameter in the interval (0,1);
            <gamma> is a number or parameter that specifies the tail length shape parameter;
            <a> is a number or parameter that specifies the optional lower bound shape parameter;
            <loc> is a number or parameter that specifies the optional location parameter;
            <scale> is a number or parameter that specifies the optional scale parameter;
            <y> is a variable or a parameter (depending on what <p> is) where the computed Pareto ppf value is saved;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

The a, loc, and scale parameters are all optional.

LET A = PA2PPF(0.95,1.5)
LET X2 = PA2PPF(X1,GAMMA)
LET X2 = PA2PPF(X1,GAMMA,A)
PLOT PA2PPF(X,GAMMA,A) FOR P = 0.01 0.01 0.99

The Pareto percent point of the second kind can be extended with location and scale parameters by using the relationship

Johnson, Kotz, and Balakrishnan (see Reference section below) define Pareto distributions of the first, second, third, and fourth kinds. Dataplot supports Pareto distributions of the first and second kinds.

None

None

PA2CDF	= Compute the Pareto second kind cumulative distribution function.
PA2PDF	= Compute the Pareto second kind probability density function.
PARPDF	= Compute the Pareto probability density function.
GEPPDF	= Compute the generalized Pareto probability density function.
EV1PDF	= Compute the extreme value type I probability density function.
WEIPDF	= Compute the Weibull probability density function.
NORPDF	= Compute the normal probability density function.
LGNPDF	= Compute the lognormal probability density function.
EXPPDF	= Compute the exponential probability density function.

"Continuous Univariate Distributions: Volume 1", 2nd. Ed., Johnson, Kotz, and Balakrishnan, John Wiley, 1994, (chapter 20).

Distributional Modeling, Income Distributions

1995/10

 
MULTIPLOT 2 2
MULTIPLOT CORNER COORDINATES 0 0 100 95
MULTIPLOT SCALE FACTOR 2
.
CASE ASIS
TITLE CASE ASIS
LABEL CASE ASIS
TITLE DISPLACEMENT 2
Y1LABEL DISPLACEMENT 15
X1LABEL DISPLACEMENT 12
X1LABEL Probability
Y1LABEL X
.
LET A = 1
TITLE Gamma = 0.5
PLOT PA2PPF(P,0.1,A) FOR P = 0.01  0.01  0.99
TITLE Gamma = 1
PLOT PA2PPF(P,1,A) FOR P = 0.01  0.01  0.99
TITLE Gamma = 2
PLOT PA2PPF(P,2,A) FOR P = 0.01  0.01  0.99
TITLE Gamma = 5
PLOT PA2PPF(P,5,A) FOR P = 0.01  0.01  0.99
END OF MULTIPLOT
.
MOVE 50 97
JUSTIFICATION CENTER
TEXT Pareto Second Kind PPF Functions