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GTRPPFName:
The algorithm for the generalized trapezoid percent point function is to compute the cumulative distribution function at the points a, b, c, and d to determine an appropriate bracketing interval. Then the appropriate equation above is inverted to find the value of the percent point function. For the interval b <= x < c, a bisection method is used.
<SUBSET/EXCEPT/FOR qualification> where <x> is a variable, number, or parameter containing values in the interval (a,d); <a> is a number, parameter, or variable that specifies the first shape parameter; <b> is a number, parameter, or variable that specifies the second shape parameter; <c> is a number, parameter, or variable that specifies the third shape parameter; <d> is a number, parameter, or variable that specifies the fourth shape parameter; <nu1> is a number, parameter, or variable that specifies the fifth shape parameter; <nu3> is a number, parameter, or variable that specifies the sixth shape parameter; <alpha> is a number, parameter, or variable that specifies the seventh shape parameter; <y> is a variable or a parameter (depending on what <p> is) where the computed ppf value is stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET Y = GTRPPF(P,0,0.2,0.8,1,2,2,0.5) LET Y = GTRPPF(P,A,B,C,D,NU1,NU3,ALPHA)
TITLE GENERALIZED TRAPEZOIDAL DISTRIBUTION LABEL CASE ASIS X1LABEL Probability Y1LABEL X LET A = 0 LET B = 0.2 LET C = 0.8 LET D = 1 LET NU1 = 1.5 LET NU3 = 2.2 LET ALPHA = 0.5 PLOT GTRPPF(P,A,B,C,D,NU1,NU3,ALPHA) FOR P = 0 0.01 1
Date created: 2/3/2004 |