The asymptotic standard error (ASE) of each parameter is simply the diagonal of the asymptotic covariance matrix. Therefore, a confidence interval of (1 -α) × 100% is given by θ ± z α/2 ASE(θ), where z α/2 is the number of standard deviations (z-score) for the given value of α/2 such that the probability of a variable being contained in the interval is