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stats: Add trimean

Browse Source 
https://en.wikipedia.org/wiki/Trimean

	The trimean is a the most efficient 3-point L-estimator (estimator
	of central tendency, i.e. average), even more robust than the
	median at estimating the average of a sample population.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-07-01 18:52:46 +01:00
parent 19135a3447
commit 2d305f6199
2 changed files with 17 additions and 0 deletions
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16
lib/igt_stats.c
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@ -528,3 +528,19 @@ double igt_stats_get_iqm(igt_stats_t *stats)
return mean;
}
/**
* igt_stats_get_trimean:
* @stats: An #igt_stats_t instance
*
* Retrieves the trimean of the @stats dataset.
*
* The trimean is a the most efficient 3-point L-estimator, even more
* robust than the median at estimating the average of a sample population.
*/
double igt_stats_get_trimean(igt_stats_t *stats)
{
double q1, q2, q3;
igt_stats_get_quartiles(stats, &q1, &q2, &q3);
return (q1 + 2*q2 + q3) / 4;
}

1
lib/igt_stats.h
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@ -63,6 +63,7 @@ void igt_stats_get_quartiles(igt_stats_t *stats,
double igt_stats_get_iqr(igt_stats_t *stats);
double igt_stats_get_iqm(igt_stats_t *stats);
double igt_stats_get_mean(igt_stats_t *stats);
double igt_stats_get_trimean(igt_stats_t *stats);
double igt_stats_get_median(igt_stats_t *stats);
double igt_stats_get_variance(igt_stats_t *stats);
double igt_stats_get_std_deviation(igt_stats_t *stats);