I've recently had another result which makes me question the randomness of the numbers being generated by the mersenne twister in MASON. I've got two classes that I am setting up the Mersenne twister in separately, because originally I was getting a series of identical numbers in when trying to use the random numbers from the main class. ---------- public ABCycle(long seed) { super (new MersenneTwisterFast(seed), new Schedule(5)); } ABCycle abc = new ABCycle(System.currentTimeMillis()); ----------------------- MersenneTwisterFast random = new MersenneTwisterFast(); random.setSeed(System.currentTimeMillis() + id); tp = maxTP * random.nextDouble(); ------ Does anything in my code look strange? My results that are emerging have some differentiation between runs, but the standard deviations are miniscule. I feel like one of the randoms is working, but others are not. mike Michael Makowsky Graduate Student Department of Economics George Mason University 703.608.1366 [log in to unmask] website: http://mason.gmu.edu/~mmakowsk