code: def conf_int(self, alpha=0.05, **kwargs):
          r
          return self.arima_res_.conf_int(alpha=alpha, **kwargs)
docs: r"""Returns the confidence interval of the fitted parameters.
  
          Returns
          -------
          alpha : float, optional (default=0.05)
              The significance level for the confidence interval. ie.,
              the default alpha = .05 returns a 95% confidence interval.
  
          **kwargs : keyword args or dict
              Keyword arguments to pass to the confidence interval function.
              Could include 'cols' or 'method'