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<?php namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical\Distributions; use PhpOffice\PhpSpreadsheet\Calculation\Exception; use PhpOffice\PhpSpreadsheet\Calculation\Functions; use PhpOffice\PhpSpreadsheet\Calculation\MathTrig; class Poisson { /** * POISSON. * * Returns the Poisson distribution. A common application of the Poisson distribution * is predicting the number of events over a specific time, such as the number of * cars arriving at a toll plaza in 1 minute. * * @param mixed $value Float value for which we want the probability * @param mixed $mean Mean value as a float * @param mixed $cumulative Boolean value indicating if we want the cdf (true) or the pdf (false) * * @return float|string The result, or a string containing an error */ public static function distribution($value, $mean, $cumulative) { $value = Functions::flattenSingleValue($value); $mean = Functions::flattenSingleValue($mean); try { $value = DistributionValidations::validateFloat($value); $mean = DistributionValidations::validateFloat($mean); $cumulative = DistributionValidations::validateBool($cumulative); } catch (Exception $e) { return $e->getMessage(); } if (($value < 0) || ($mean < 0)) { return Functions::NAN(); } if ($cumulative) { $summer = 0; $floor = floor($value); for ($i = 0; $i <= $floor; ++$i) { $summer += $mean ** $i / MathTrig\Factorial::fact($i); } return exp(0 - $mean) * $summer; } return (exp(0 - $mean) * $mean ** $value) / MathTrig\Factorial::fact($value); } }