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stats: Add support for quartiles (and thus median)

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More stuff, quite useful characteristics of a dataset.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau
2015-06-27 15:33:58 +01:00
parent 3839bacde8
commit 1b8997b3f8
3 changed files with 177 additions and 0 deletions
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lib/tests/igt_stats.c
+41
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@@ -25,6 +25,8 @@
#include "igt_core.h"
#include "igt_stats.h"
#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
static void push_fixture_1(igt_stats_t *stats)
{
igt_stats_push(stats, 2);
@@ -78,6 +80,44 @@ static void test_range(void)
igt_assert(igt_stats_get_range(&stats) == 8);
}
/*
* Examples taken from: https://en.wikipedia.org/wiki/Quartile
* The values are shifted a bit to test we do indeed start by sorting data
* set.
*/
static void test_quartiles(void)
{
static const uint64_t s1[] =
{ 47, 49, 6, 7, 15, 36, 39, 40, 41, 42, 43 };
static const uint64_t s2[] = { 40, 41, 7, 15, 36, 39 };
igt_stats_t stats;
double q1, q2, q3;
/* s1, odd number of data points */
igt_stats_init(&stats, ARRAY_SIZE(s1));
igt_stats_push_array(&stats, s1, ARRAY_SIZE(s1));
igt_stats_get_quartiles(&stats, &q1, &q2, &q3);
igt_assert_eq_double(q1, 25.5);
igt_assert_eq_double(q2, 40);
igt_assert_eq_double(q3, 42.5);
igt_assert_eq_double(igt_stats_get_median(&stats), 40);
igt_stats_fini(&stats);
/* s1, even number of data points */
igt_stats_init(&stats, ARRAY_SIZE(s2));
igt_stats_push_array(&stats, s2, ARRAY_SIZE(s2));
igt_stats_get_quartiles(&stats, &q1, &q2, &q3);
igt_assert_eq_double(q1, 15);
igt_assert_eq_double(q2, 37.5);
igt_assert_eq_double(q3, 40);
igt_assert_eq_double(igt_stats_get_median(&stats), 37.5);
igt_stats_fini(&stats);
}
static void test_mean(void)
{
igt_stats_t stats;
@@ -150,6 +190,7 @@ igt_simple_main
test_init();
test_min_max();
test_range();
test_quartiles();
test_mean();
test_invalidate_mean();
test_std_deviation();