public static double quantile(double x,double mu,double sigma,double skew){
  x=NormalDistribution.standardNormalQuantile(x);
  if (Math.abs(skew) > 0.) {
    x=(1. - Math.exp(-skew * x)) / skew;
  }
  return mu + sigma * x;
}

public static double quantile ( double x , double mu , double sigma , double skew ) { x = NormalDistribution . standardNormalQuantile ( x ) ; if ( Math . abs ( skew ) > 0. ) { x = ( 1. - Math . exp ( - skew * x ) ) / skew ; } return mu + sigma * x ; }
inverse cumulative probability density function ( probit ) of a normal distribution .
