Todo List

Global a_gamma (double gamma, double y, double a, double b)

Check input values

Global A_gamma (double gamma, double za, double zb, double yl, double yu, double ybar, double sigma)

Check input values

Global B_gamma (double gamma, double za, double zb, double yu, double ybar, double sigma)

Check input values

Global b_gamma (double gamma, double y, double b)

Check input values

Global loadgdrs (struct gdrs_struct *gdrs, const char *fname)

Implement percentiles