Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx> --- lib/igt_stats.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/igt_stats.c b/lib/igt_stats.c index 12cabba..bd05550 100644 --- a/lib/igt_stats.c +++ b/lib/igt_stats.c @@ -121,6 +121,11 @@ bool igt_stats_is_population(igt_stats_t *stats) * [Bessel's correction](https://en.wikipedia.org/wiki/Bessel%27s_correction) * to the variance. * + * Note that even if we manage to have an unbiased variance by multiplying + * a sample variance by the Bessel's correction, n/(n - 1), the standard + * deviation derived from the unbiased variance isn't itself unbiased. + * Statisticians talk about a "corrected" standard deviation. + * * When giving #true to this function, the data set in @stats is considered a * full population. It's considered a sample of a bigger population otherwise. * -- 2.1.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
