def METHOD_NAME(self, mu, sigma, skw):
    """Map to parameters e, w, a.
    :param mu: mean
    :param sigma: standard deviation
    :param skw: skewness
    :return: e, w, a
    """
    delta = self._delta_skw(skw)
    a = self._alpha_delta(delta)
    w = self._w_sigma_delta(sigma, delta)
    e = self._e_mu_w_delta(mu, w, delta)
    return e, w, a