public static double BinomialPDF(double p, int n, int k)
{
//k为成功次数
BigNumber Combination = MathV.Combination(n, k).ToString();
return((double)Combination * Math.Pow(p, k) * Math.Pow(1 - p, n - k));
}
public static double BetaPrediction(int a, int b, int n, int y)
{
BigInteger Numerator = MathV.Factorial(a + b - 1);
BigInteger Denominator = MathV.Factorial(a - 1) * MathV.Factorial(b - 1);
BigNumber Quotient = (BigNumber)Numerator.ToString() / (BigNumber)Denominator.ToString();
double NormConst = (double)Quotient;
Numerator = MathV.Combination(n, y) * MathV.Factorial(y + a - 1) * MathV.Factorial(n - y + b - 1);
Denominator = MathV.Factorial(a + b + n - 1);
Quotient = (BigNumber)Numerator.ToString() / (BigNumber)Denominator.ToString();
return(NormConst * (double)Quotient);
}
