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Diffstat (limited to 'lib/igt_stats.c')
| -rw-r--r-- | lib/igt_stats.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/igt_stats.c b/lib/igt_stats.c index 12cabba0..bd055503 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. * |