/**
* @param SampleCollection $sampleCollection
*
* @return float
*/
public function calculateCoefficient(SampleCollection $sampleCollection)
{
$x = $sampleCollection->getX();
$y = $sampleCollection->getY();
$x2 = new SampleDimension([]);
$y2 = new SampleDimension([]);
$xy = new SampleDimension([]);
for ($i = 0; $i < $sampleCollection->getSampleCount(); $i++) {
$xy[] = $sampleCollection->getX()[$i] * $sampleCollection->getY()[$i];
$x2[] = pow($sampleCollection->getX()[$i], 2);
$y2[] = pow($sampleCollection->getY()[$i], 2);
}
$sub = $sampleCollection->getSampleCount() * $xy->getSumOf() - $x->getSumOf() * $y->getSumOf();
$diff1 = $this->calculateDiff($sampleCollection->getSampleCount(), $x->getSumOf(), $x2->getSumOf());
$diff2 = $this->calculateDiff($sampleCollection->getSampleCount(), $y->getSumOf(), $y2->getSumOf());
return $sub / sqrt($diff1 * $diff2);
}
/**
* @return int
*/
public function getSampleCount()
{
return $this->x->getCount();
}
