export declare function NormalCDF(x: number, mean: number, stdev: number): number;
export declare function NormalInv(p: number): number;
export declare function Lgamma(x: number): number;
export declare function RegularizedGammaP(a: number, x: number): number;
export declare function RegularizedBetaI(x: number, a: number, b: number): number;