Association p-value for candidate markers.

def pvalues(self):
        """Association p-value for candidate markers."""
        self.compute_statistics()

        lml_alts = self.alt_lmls()
        lml_null = self.null_lml()

        lrs = -2 * lml_null + 2 * asarray(lml_alts)

        from scipy.stats import chi2
        chi2 = chi2(df=1)

        return chi2.sf(lrs)