[ILUG] how to answer the question: "how random?"

[John Ronan]

http://www.phrack.com/search.phtml?view&article=p54-5

Has some links as well to test suites.... 


>> 
>> You should do the tests multiple times. Also if you're dividing the range
>> into "n" buckets, output a graph every n*10 samples and take at least
>> n*100 samples. You may want to measure the standard deviation at each
>> stage, or you may not as it might not mean enough to you if you slept
>> through stats.
> 
> Well, the "random" sequence 0 1 2 3 4 5 6 7 8 9 <repeat> will give
> you a perfectly even distribution, but very little randomness.
> 
> Get a fourier transform of a large sample.  Perfectly random
> data will have equal "power" at all "frequencies" (terms power
> and frequency make more sense to us electronics guys - pure
> white noise has a flat frequency spectrum).
> 
> Later,
> Kenn
> 
> 
> -- 
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E-Mail: John Ronan <j0n at tssg.wit.ie>
Date: 27-Apr-01
Time: 20:23:15

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