本文借助于平稳时间序列的极值分布理论，对南京地区异常低温事件频次和强度建立统计模型。

The statistical model of frequency and intensity of anomalous microtherm events in Nanjing is established by means of the extreme value distribution theory of stationary time series.

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本文结合一大跨悬挑平屋盖模型的风洞试验研究，分析了此类结构屋盖的平均局部体型系数和极值局部体型系数的分布特性；

Based on the wind tunnel tests for large span cantilevered flat roof, the distributing characteristics of mean local shape factor and extreme local shape factor of the roof are studied.

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第二步是利用极值理论模型拟合信用损失的尾部分布。

The second step is by using EVT to fit the tail of credit loss distribution.

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