strange %SYSLPUT warning

[Rick_SAS]

It looks like your program is using a macro loop to run simulations. You might want to read this article on techniques for performing efficient simulations in SAS: Simulation in SAS

[derrick]

I wish I could use BY processing.  However, the EM algorithm is iterative and switches between PROC IML and many datastep.  Each simulation requires a different number of iterations.  I'm not using any PROCs that utilize BY processing.