Chapter Contents |
Previous |
Next |
RANTBL |
Category: | Random Number |
Tip: | If you want to change the seed value during execution, you must use the CALL RANTBL routine instead of the RANTBL function. |
Syntax | |
Arguments | |
Details | |
Comparisons | |
See Also |
Syntax |
RANTBL(seed,p1 ,... p_{i}... ,p_{n}) |
Range: | seed < 2^{31}-1 |
Note: | If seed 0, the time of day is used to initialize the seed stream. |
Range: | 0 p_{i} 1 for 0 <i n |
Details |
The RANTBL function returns a variate that is generated from the probability mass function defined by p_{1} through p_{n} . An inverse transform method applied to a RANUNI uniform variate is used. RANTBL returns
If, for some index j<n, , RANTBL returns only the indices 1 through j with the probability of occurrence of the index j equal to .
Let n=3 and P1, P2, and P3 be three probabilities with P1+P2+P3=1, and M1, M2, and M3 be three variables. The variable X in these statements
array m{3} m1-m3; x=m{rantbl(seed,of p1-p3)};will be assigned one of the values of M1, M2, or M3 with probabilities of occurrence P1, P2, and P3, respectively.
Comparisons |
See Also |
Call routine:
CALL RANTBL |
Chapter Contents |
Previous |
Next |
Top of Page |
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.