Chris Wilson
19135a3447
stats: Add the interquartile mean (IQM)
...
https://en.wikipedia.org/wiki/Interquartile_mean
The IQM is a truncated mean and so is very similar to the scoring
method used in sports that are evaluated by a panel of judges:
discard the lowest and the highest scores; calculate the mean
value of the remaining scores.
It's useful to hide outliers in measurements (due to cold cache etc),
without having to worry too much about the actual distribution.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2015-07-01 18:58:46 +01:00
Damien Lespiau
66e0bf66da
stats: Spwan igt_init_with_size() from igt_init()
...
It's all about good looking APIs.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 19:05:41 +01:00
Damien Lespiau
fabde384a3
stats: Add support for the interquartile range (IQR)
...
IQR is a good measure of dispersion.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:08 +01:00
Damien Lespiau
1b8997b3f8
stats: Add support for quartiles (and thus median)
...
More stuff, quite useful characteristics of a dataset.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:08 +01:00
Damien Lespiau
3839bacde8
stats: Add a bulk version of _push()
...
In case we want to push a bunch of values in one go.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:08 +01:00
Damien Lespiau
0e4c175e04
stats: Add igt_stats_get_range()
...
Somewhat useful, for instance to size an histogram.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
4a89a841a1
stats: Add functions to retrieve min/max values of the dataset
...
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
da123adeae
stats: Add a getter for the population property
...
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
3a5cf84317
stats: Add a way to specify if the data set is a population or a sample
...
This changes how we compute the variance. We want an unbiased variance
when reasoning about a sample.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
a2f6fd3725
stats: Add gtkdoc section for igt_stats
...
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
087a8d1c63
stats: Add header gards
...
Sigh.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:04:07 +01:00
Damien Lespiau
515cec1210
stats: Add a way to retrieve the standard deviation
...
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:03:27 +01:00
Damien Lespiau
05c10f940f
stats: Use an algorithm popularised by Knuth to compute mean and variance
...
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:03:27 +01:00
Damien Lespiau
e55a11d3eb
stats: Be more precise and talk about mean, not average
...
There are several types of averages eg. mean, median and mode.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-27 16:03:27 +01:00
Damien Lespiau
06f5f7065f
lib: Add a tiny utility function to compute averages
...
The master plan would be to get a bit more stats in it, at least the
standard deviation and confidence interval. Just need the average for
now.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
2015-06-25 17:22:03 +01:00
