Re: [boost] [Random] - statistics_test for boost::uuids::detail::seed_rng

Subject: Re: [boost] [Random] - statistics_test for boost::uuids::detail::seed_rng
From: Andy Tompkins (atompkins_at_[hidden])
Date: 2011-03-14 19:07:19

On Sun, 13 Mar 2011 11:40 -0700, "Steven Watanabe"
<watanabesj_at_[hidden]> wrote:
> AMDG
> 
> On 03/13/2011 11:25 AM, Andy Tompkins wrote:
> > I'm trying to determine how well the boost::uuids::detail::seed_rng
> > generates random numbers.
> >
> > I changed (just on my machine) the statistics_test of the random library
> > so that it will also test seed_rng.  Sadly I don't really know how to
> > interpret the results that follow.  I included the mt19937 results as
> > well.  I assume the results are good.  Would someone confirm that and
> > maybe tell me how good/bad they are?
> 
> I think the * indicates a potential issue.
> Other than that, it's been a while since I
> looked at the code, so I don't remember
> what the output means off the top of my head.

The * is for mt19937, thus even if it is an issue, I would assume that
it is not an issue with seed_rng.

In any event, thank you for your answer.

Do you (or the community) thing this should live in Boost.Random instead
of a detail of Boost.Uuid?

> 
> > D:\Code\boost-trunk\libs\random\test>statistic_tests.exe
> > Confidence level: 0.99; 1-alpha = 0.01; chi_square(19, 36.1909) = 0.99
> > Running tests on seed_rng
> > KS: 15.92 16.4
> > equidistribution: 19.28 15.84  2D: 27.12 17.6
> > runs: up: 18 33.04   down: 22.96 11.12 gaps: 23.6 15.68
> > poker: 15.6 24.32
> > coupon collector: 17.2 11.76
> > permutation: 27.92 21.12
> > maximum-of-t: 24.4 8.48
> > birthday spacing: 16.4 20.5333
> >
> > Running tests on mt19937
> > KS: 21.36 19.2
> > equidistribution: 22.16 20.88  2D: 29.2 18
> > runs: up: 16.72 19.04   down: 21.68 37.6* [0.00666986] gaps: 12.72 19.2
> > poker: 18.48 14.8
> > coupon collector: 18 11.76
> > permutation: 17.04 22.8
> > maximum-of-t: 14.96 22.08
> > birthday spacing: 19.6 10.6667
> 
> In Christ,
> Steven Watanabe
> 

Regards,
Andy Tompkins