Wayne Harris

This makes sense. Thanks for the explanation.

Your language is a little beyond my currenty capacity for understanding. You're saying no, not having detected anything wrong with a sample of 2^15 bytes does not let us say that Xorshift is not nonrandom up to 2^15. I thought Xorshift 32 were 32 bits in internal state. So 2^15 is well below the internal state capacity. You're saying PractRand is deliberatly designed not to try to claim a generator as non-random consuming only roughly their state size. Then you give us two reasons for that. Am I...

Thanks very much! I was able to locate it.

If I restrict the sample sizes to 2^15 bytes, nothing against Xorshift 32 is found. Does it make sense to say that up to 2^15 bytes, Xorshift cannot be said to be nonrandom? C:\random>xorshift.exe | RNG_test.exe stdin32 -tlmax 32KB RNG_test using PractRand version 0.94 RNG = RNG_stdin32, seed = unknown test set = core, folding = standard (32 bit) rng=RNG_stdin32, seed=unknown length= 32 kilobytes (2^15 bytes), time= 0.1 seconds no anomalies in 34 test result(s)

Thank you, Cerian Knight. I found the binaries in 0.94 and I had to only download msvcr120.dll and msvcp120.dll to make them run. (It'd be nice to have those DLL included in the package, if Microsoft allows such thing.) It runs now just fine, so I'm good. For the record, I was also able to compile 0.94 just fine. Notice my command lines are not precisely those in the documentation. We don't need -lpthread during compilation, only during linking. Since I'm using GNU tools, I had to add -std=gnu++11...

Thank you for the info. Which documentation is that? I'm searching through User’s guide detailed version, User’s guide compact version, MyLib-C, ProbDist. I can't find this quote on any of them.

But a p-value close to 1 is not statistically unlikely. Quite the contrary. It is highly statiscally likely. It is telling us that that sample extracted (or one more atypical than it) has almost 100% probabily of ocurring. In other words, there is nothing unsual about that at all. (Or am I reading this whole thing incorrectly?)

I usually run PractRand on GNU systems, but I can see that it should run on Windows too. Perhaps it was meant to be run on Windows. Must I compile it or is there an executable somewhere? Thank you.