'A confidence level for the log odds ratio.
Parameters
alpha : float
`1 - alpha` is the nominal coverage probability of the
confidence interval.
method : string
The method for producing the confidence interval.  Currently
must be \'normal\' which uses the normal approximation.'

def log_oddsratio_confint(self, alpha=0.05, method='normal'):

    f = (- stats.norm.ppf((alpha / 2)))
    lor = self.log_oddsratio
    se = self.log_oddsratio_se
    lcb = (lor - (f * se))
    ucb = (lor + (f * se))
    return (lcb, ucb)
