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Вычисление среднего значения из ряда чисел с выделением (и удалением) аномальных значений
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| private function averageNormaly(array $numbers) | |
| { | |
| $n = count($numbers); | |
| $average = 0; | |
| foreach ($numbers as $number) { | |
| $average += $number['value']; | |
| } | |
| $average = $average / $n; | |
| //От каждого значения выборки отнимаем среднее арифметическое. | |
| //Каждую полученную разницу возводим в квадрат. | |
| //Суммируем полученные значения квадратов разниц | |
| $standardDeviation = 0; | |
| foreach ($numbers as $number) { | |
| $x = $numbers['value'] - $average; | |
| $x = $x * $x; | |
| $standardDeviation += $x; | |
| } | |
| $nn = $n - 1; | |
| $standardDeviation = $standardDeviation / $nn; | |
| $standardDeviation = sqrt($standardDeviation); | |
| $up = $average + $standardDeviation; | |
| $down = $average - $standardDeviation; | |
| $averageNormal = 0; | |
| $xn = 0; | |
| // Считаем среднее арифметическое без чисел выпавших из стандартного отклонения | |
| foreach ($numbers as $number) { | |
| if ($number['value'] <= $up AND $number['value'] >= $down) { | |
| $averageNormal += $number['value']; | |
| $xn++; | |
| } | |
| } | |
| $averageNormal = $averageNormal / $xn; | |
| return $averageNormal; | |
| } |
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