

def _forecast_conf_int(self, forecast, fcasterr, alpha):
    const = norm.ppf((1 - (alpha / 2.0)))
    conf_int = np.c_[((forecast - (const * fcasterr)), (forecast + (const * fcasterr)))]
    return conf_int

dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/arima_model.py ARMAResults._forecast_conf_int/original