void effic2_v(unsigned length, int *k, int *N, double conflevel, double *mode, double *low, double *high)
void effic2(int k, int N, double conflevel, double &mode, double &low, double &high)
void effic(int k, int N, double conflevel, double &mode, double &low, double &high)
void effic2_r(int *length, int *k, int *N, double *conflevel, double *mode, double *low, double *high)