def _forecast_conf_int(self, forecast, fcerr, alpha):
        const = norm.ppf(1 - alpha/2.)
        conf_int = np.c_[forecast - const*fcerr, forecast + const*fcerr]
        return conf_int
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/arima_model.py/ARIMAResults._forecast_conf_int/original