Import simple dichotomous values.

        Dichotomous values are found on one line, therefore one regex will
        return up to three possible matches for the Chi^2, degrees of freedom,
        and p-value.

def _import_dich_vals(self):
        """
        Import simple dichotomous values.

        Dichotomous values are found on one line, therefore one regex will
        return up to three possible matches for the Chi^2, degrees of freedom,
        and p-value.
        """
        m = re.search(
            r"Chi\^2 = ({0}|\w+) +d.f. = +({0}|\w+) +P-value = +({0}|\w+)".format(
                self.re_num
            ),  # noqa
            self.output_text,
        )
        cw = {1: "Chi2", 2: "df", 3: "p_value4"}
        for val in cw:
            try:
                self.output[cw[val]] = float(m.group(val))
            except:
                self.output[cw[val]] = -999