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The MODEL Procedure |
The following random-number functions are supported: RANBIN, RANCAU, RANEXP, RANGAM, RANNOR, RANPOI, RANTBL, RANTRI, and RANUNI. For more information, refer to SAS Language: Reference.
Each reference to a random-number function sets up a separate pseudo-random sequence. Note that this means that two calls to the same random function with the same seed produce identical results. This is different from the behavior of the random-number functions used in the SAS DATA step. For example, the statements
x=rannor(123); y=rannor(123); z=rannor(567);
produce identical values for X and Y, but Z is from an independent pseudo-random sequence.
For FIT tasks, all random-number functions always return 0. For SOLVE tasks, when Monte Carlo simulation is requested, a random-number function computes a new random number on the first iteration for an observation (if it is executed on that iteration) and returns that same value for all later iterations of that observation. When Monte Carlo simulation is not requested, random-number functions always return 0.
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