| public static relativeFrequency ( array $values ) : array | ||
| $values | array | Ex: ( A, A, A, A, A, A, B, B, B, C ) |
| return | array | relative frequency distribution Ex: ( A => 0.6, B => 0.3, C => 0.1 ) |
public static function relativeFrequency(array $values) : array
{
$sample_size = count($values);
$relative_frequencies = array();
foreach (self::frequency($values) as $subject => $frequency) {
$relative_frequencies[$subject] = $frequency / $sample_size;
}
return $relative_frequencies;
}