Article
Summary:
Let $P_r\{.\}$ be the probability measure corresponding to a two-dimensional normal distribution with zero means, unit variances and the correlation coefficient $r$. A method for numerical evaluation of the probabilities $P_r\{(-a,a)\times (-a,a)\}$ and $P_r\{(-\infty,a)\times (-\infty,a)\}$ is suggested in the paper, which is particularly advantageous when $r$ is near to 1 or -1.
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