/**
* Returns the percent-point function, the inverse of the cdf
*
* @param float $x The test value
* @return float The value that gives a cdf of $x
*/
public function ppf($x)
{
return $this->calculator->getPpf($x, $this->lambda, $this->k);
}
/**
* Returns the percent-point function, the inverse of the cdf
*
* @param float $x The test value
* @param float $sigma The scale parameter
* @return float The value that gives a cdf of $x
*/
public function getPpf($x, $sigma = 1)
{
$lambda = $this->convertSigmaToLambda($sigma);
return $this->wei->getPpf($x, $lambda, 2);
}
