FRM®二级知识点:Unconditional and Conditional Coverage
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发布时间:2022-01-26 14:24
阅读:633次

Unconditional coverage:
we are not concerned about
independence of exception observations
or the timing of when the exceptions occur.
we simply are concerned with
the number of total exceptions.
Kupiec(1995)determined a measure to accept or reject models using the tail points of a log-likelihood ratio(LR).
We would reject the hypothesis that the model is correct if the LRuc>3.84
In the JPM example,LRuc=3.91,therefore,we reject unconditional coverage.
LRuc>3.84,则model不正确。
Conditional coverage:
by including a measure of the independence of exceptions,we can measure conditional coverage of the model.
The test for conditional coverage should be performed when exceptions are clustered together.
当exception扎堆时,用条件覆盖去检验。
如果短时间内发生的exception过多,则市场风险增加,因为VaR短时间内反应慢,还没有进行预警。
推荐阅读:【FRM®二级知识点:VaR mapping】
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