Hi. I see you are using the RANUNI function. Take a look at the RAND function that replaces EVERY previous random function. You set the seed with "Call Streaminit(seed);" and to get uniform random numbers, you use "Variable = rand('Uniform');". The beauty of this function is that by changing the first argument you can generate normal, Bernoulli, Poisson, etc. You can also set a mean and standard deviation for normal distributions. Take a look. I think you will like this function. SAS recommends it and says it generates "better" random strings.
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