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<?php |
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namespace devfym\IntelliPHP\Math; |
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use devfym\IntelliPHP\Traits\IsNotNullTrait; |
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class Measurement |
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{ |
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protected $sample; |
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protected $sum; |
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protected $count; |
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use IsNotNullTrait; |
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public function __construct(array $inputs) |
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{ |
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$this->sample = array_values(array_filter($inputs, array($this, 'is_not_null'))); |
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$this->sum = array_sum($this->sample); |
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$this->count = count($this->sample); |
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} |
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final public function mean(int $decimal = 4) : float |
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{ |
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return round($this->sum / $this->count, $decimal); |
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} |
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final public function max(int $decimal = 4) : float |
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{ |
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$max = $this->sample[0]; |
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for ($i = 1; $i < $this->count; $i++) { |
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$max = max($max, $this->sample[$i]); |
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} |
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return round($max, $decimal); |
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} |
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final public function min(int $decimal = 4) : float |
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{ |
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$min = $this->sample[0]; |
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for ($i = 1; $i < $this->count; $i++) { |
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$min = min($min, $this->sample[$i]); |
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} |
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return round($min, $decimal); |
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} |
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final public function quartile(int $Q, int $decimal = 4) : float |
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{ |
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$sort_sample = $this->sample; |
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sort($sort_sample); |
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$quartile = ($Q / 4) * (($this->count) + 1); |
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return round($sort_sample[$quartile - 1], $decimal); |
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} |
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final public function median(int $decimal = 4) : float |
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{ |
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return $this->quartile(2, $decimal); |
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} |
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final public function variance(int $decimal = 4) : float |
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{ |
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$mean = $this->mean(4); |
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$total_s = 0; |
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foreach ($this->sample as $s) { |
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$total_s += pow(($s - $mean), 2); |
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} |
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$variance = $total_s / $this->count; |
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return round($variance, $decimal); |
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} |
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final public function std(int $decimal = 4) : float |
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{ |
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$std = sqrt($this->variance($decimal)); |
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return round($std, $decimal); |
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} |
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} |
devfym /
intelliphp
