/// <summary>
/// This function return the value of this ChiSquareFunction for given x
/// </summary>
/// <param name="x">double. x</param>
/// <returns>
/// the value of this ChiSquareFunction for given x
/// </returns>
public override double Value(double x)
{
double result;
GammaFunction function = new GammaFunction();
result = 1.0 / (Math.Pow(2.0, 0.5 * this.k) * function.Value(0.5 * this.k));
result *= Math.Exp(-0.5 * x);
result *= Math.Pow(x, 0.5 * this.k - 1.0);
return(result);
}
/// <summary>
/// This function return the value of FisherFunction for given x
/// </summary>
/// <param name="x">double. x</param>
/// <returns>
/// The value of FisherFunction for given x
/// </returns>
public override double Value(double x)
{
double GpG, result;
int k1plusk2 = this.k1 + this.k2;
GammaFunction function = new GammaFunction();
GpG = function.Value(0.5 * k1plusk2) /
(function.Value(0.5 * this.k1) * function.Value(0.5 * this.k2));
result = GpG * Math.Pow(this.k1, 0.5 * this.k1) * Math.Pow(this.k2, 0.5 * this.k2);
result *= Math.Pow(x, 0.5 * this.k1 - 1.0) * Math.Pow(this.k2 + this.k1 * x, -0.5 * k1plusk2);
return result;
}
/// <summary>
/// This function return the value of FisherFunction for given x
/// </summary>
/// <param name="x">double. x</param>
/// <returns>
/// The value of FisherFunction for given x
/// </returns>
public override double Value(double x)
{
double GpG, result;
int k1plusk2 = this.k1 + this.k2;
GammaFunction function = new GammaFunction();
GpG = function.Value(0.5 * k1plusk2) /
(function.Value(0.5 * this.k1) * function.Value(0.5 * this.k2));
result = GpG * Math.Pow(this.k1, 0.5 * this.k1) * Math.Pow(this.k2, 0.5 * this.k2);
result *= Math.Pow(x, 0.5 * this.k1 - 1.0) * Math.Pow(this.k2 + this.k1 * x, -0.5 * k1plusk2);
return(result);
}