def _logpdf(self, x, a, b): return crv_helper._norm_logpdf(x) - self._logdelta
def _lnpdf(self, x): return _norm_logpdf( (x - self.mean) / self.sigma) - np.log(self.sigma) - self.lognorm
def _lnpdf(self, x): return _norm_logpdf((x - self.mean) / self.sigma) - np.log(self.sigma) - self.lognorm