方法在双正态模型基础下应用ML估计方法计算ROC曲线下面积，正态近似法估计面积的可信区间及假设检验。
Methods On the basis of binormal model, maximum likelihood estimation was applied to areas calculation, and approximately normal method to confidence interval estimation and hypothesis test.
假定网架结构制作偏差近似服从正态随机分布，利用舍选法实现了正态随机变量的抽样。
The manufacturing deviation of grids structures was assumed to be in normal distribution, and the normal random sampling was realized by acceptance-rejection method.
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