void BetaStat(double a, double b, double &AMean, double &AVariance, double &ASkewness, double &AKurtosis);
Beta distribution moments (mean, variance, skewness, excess kurtosis).
| # | Name | Type | Description |
|---|---|---|---|
| 1 | a | double | First shape parameter, real value > 0. |
| 2 | b | double | Second shape parameter, real value > 0. |
| 3 | AMean | double & | Returns the mean, = a/(a+b). |
| 4 | AVariance | double & | Returns the variance, = a b / ((a+b)^2 (a+b+1)). |
| 5 | ASkewness | double & | Returns the skewness, = 2(b-a) sqrt(a+b+1) / ((a+b+2) sqrt(a b)). |
| 6 | AKurtosis | double & | Returns the EXCESS kurtosis. |
Remarks:
Returns the moments of the beta distribution. If a <= 0 or b <= 0 all four outputs are NAN.
Declared in Dew::Math::Units::Probabilities · Dew.Math/Units.Probabilities.h · Cross-compiler