> On Nov 24, 2015, at 3:50 AM, Gilles <gil...@harfang.homelinux.org> wrote: > >> On Tue, 24 Nov 2015 11:40:23 +0100, Luc Maisonobe wrote: >> Hi all, >> >> It seems the new bootstrap method introduced in fbc327e9 in order >> to solve MATH-1246 creates some random test failures. >> >> The reason is that an EnumeratedRealDistribution instance is >> created without a random generator (there are no way to pass >> a random generator in the bootstrap method). This >> EnumeratedRealDistribution will therefore create a Well19937c >> generator with the default constructor, which uses time to seed >> the generator. Depending on the way this generator is seeded, >> the testBootstrapSmallSamplesWithTies test fails quite often. > > If it fails often, doesn't it indicate a problem with the code or > a wrong assumption about the test? >
Possibly, but not likely. The bootstrap estimates are not very stable. The same instability is evident in the R tests of ks.boot. I will find a way to supply a fixed seed. I am still working on the full resolution of MAtH-1246 which requires adding jitter. The bootstrap is an optional method never activated by the default implementation. I am close to having the jitter code ready to commit. Phil > Best, > Gilles > >> Would it be possible to pass a random generator somewhere and >> to configure it with a fixed seed for the Junit tests? >> >> best regards, >> Luc > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
