PhpBench\Model\Variant::computeStats PHP Метод

    public function computeStats()
    {
        $this->rejects = [];
        $revs = $this->getRevolutions();
        if (0 === count($this->iterations)) {
            return;
        }
        $times = $this->getMetricValuesByRev(TimeResult::class, 'net');
        $retryThreshold = $this->getSubject()->getRetryThreshold();
        $this->stats = new Distribution($times, $this->computedStats);
        foreach ($this->iterations as $iteration) {
            // deviation is the percentage different of the value from the mean of the set.
            if ($this->stats->getMean() > 0) {
                $deviation = 100 / $this->stats->getMean() * ($iteration->getResult(TimeResult::class)->getRevTime($iteration->getVariant()->getRevolutions()) - $this->stats->getMean());
            } else {
                $deviation = 0;
            }
            // the Z-Value represents the number of standard deviations this
            // value is away from the mean.
            $revTime = $iteration->getResult(TimeResult::class)->getRevTime($revs);
            $zValue = $this->stats->getStdev() ? ($revTime - $this->stats->getMean()) / $this->stats->getStdev() : 0;
            if (null !== $retryThreshold) {
                if (abs($deviation) >= $retryThreshold) {
                    $this->rejects[] = $iteration;
                }
            }
            $iteration->setResult(new ComputedResult($zValue, $deviation));
        }
        $this->computed = true;
    }

 private function processVariant(Variant $variant, \DOMElement $variantEl, array $resultClasses)
 {
     $errorEls = $variantEl->query('.//error');
     if ($errorEls->length) {
         $errors = [];
         foreach ($errorEls as $errorEl) {
             $error = new Error($errorEl->nodeValue, $errorEl->getAttribute('exception-class'), $errorEl->getAttribute('code'), $errorEl->getAttribute('file'), $errorEl->getAttribute('line'), '');
             $errors[] = $error;
         }
         $variant->createErrorStack($errors);
         return;
     }
     foreach ($variantEl->query('./iteration') as $iterationEl) {
         $results = [];
         foreach ($iterationEl->attributes as $attributeEl) {
             $name = $attributeEl->name;
             if (false === strpos($name, '-')) {
                 throw new \RuntimeException(sprintf('Expected attribute name to have a result key prefix, got "%s".', $name));
             }
             $prefix = substr($name, 0, strpos($name, '-'));
             if (!isset($resultClasses[$prefix])) {
                 throw new \RuntimeException(sprintf('No result class was provided with key "%s" for attribute "%s"', $prefix, $name));
             }
             $suffix = substr($name, strpos($name, '-') + 1);
             $results[$prefix][str_replace('-', '_', $suffix)] = $attributeEl->value;
         }
         $iteration = $variant->createIteration();
         foreach ($results as $resultKey => $resultData) {
             $iteration->setResult(call_user_func_array([$resultClasses[$resultKey], 'fromArray'], [$resultData]));
         }
     }
     // TODO: Serialize statistics ..
     $variant->computeStats();
 }