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Moved standard_deviation function to global scope

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This commit is contained in:
Jon Ziebell 2021-02-17 21:18:25 -05:00
parent a62840585e
commit 93abd4e92a
2 changed files with 20 additions and 27 deletions
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18
api/index.php
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@ -67,3 +67,21 @@ function array_mean($array) {
return array_sum($array) / $count;
}
// Useful function
function array_standard_deviation($array) {
$count = count($array);
if ($count === 0) {
return null;
}
$mean = array_mean($array);
$variance = 0;
foreach($array as $i) {
$variance += pow(($i - $mean), 2);
}
return round(sqrt($variance / $count), 1);
}

29
api/thermostat.php
View File

@ -529,10 +529,9 @@ class thermostat extends cora\crud {
foreach($metric_codes as $parent_metric_name => $parent_metric) {
foreach($parent_metric as $child_metric_name) {
$data = $this->remove_outliers($metrics[$parent_metric_name][$child_metric_name]['values']);
// print_r($data);
if(count($data['values']) > 0) {
$metrics[$parent_metric_name][$child_metric_name]['histogram'] = $data['histogram'];
$metrics[$parent_metric_name][$child_metric_name]['standard_deviation'] = $this->standard_deviation($data['values']);
$metrics[$parent_metric_name][$child_metric_name]['standard_deviation'] = array_standard_deviation($data['values']);
$metrics[$parent_metric_name][$child_metric_name]['median'] = floatval(array_median($data['values']));
unset($metrics[$parent_metric_name][$child_metric_name]['values']);
} else {
@ -544,30 +543,6 @@ class thermostat extends cora\crud {
return $metrics;
}
/**
* Calculate the standard deviation of an array of numbers.
*
* @param array $array The values.
*
* @return int The standard deviation.
*/
private function standard_deviation($array) {
$count = count($array);
if ($count === 0) {
return null;
}
$mean = array_mean($array);
$variance = 0;
foreach($array as $i) {
$variance += pow(($i - $mean), 2);
}
return round(sqrt($variance / $count), 1);
}
/**
* Remove outliers more than 2 standard deviations away from the mean. This
* is an effective way to keep the scales meaningul for normal data.
@ -578,7 +553,7 @@ class thermostat extends cora\crud {
*/
private function remove_outliers($array) {
$mean = array_mean($array);
$standard_deviation = $this->standard_deviation($array);
$standard_deviation = array_standard_deviation($array);
$min = $mean - ($standard_deviation * 2);
$max = $mean + ($standard_deviation * 2);