哔同学2018-11-01 13:30:58
请问这道题c选项,为什么基础班在讲的时候说severity都是thin tail但选项却说是fat tail,而且weibull分布什么的确实是thin tail啊
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Cindy2018-11-01 17:55:18
同学你好,这两段话都是原版书上的原话哦,我把它们截下来,你看看The most common and least complex approach to modeling severity is to use a lognormal distribution, although low frequency losses may fit better to other options such as Generalized Gamma, Transformed Beta, Generalized Pareto, or Weibull. Regulators take a keen interest in how well the selected distribution demonstrates “goodness of fit”
Whichever distribution is selected, the probability density function for severity will have a fat tail, that is to say that very large events (beyond three standard deviations of the mean) are more likely to occur than in a normal distribution.
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所以有统一的说法吗,到底是瘦尾还是肥尾
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同学你好,是这样,咱们可以把尾巴分为两部分来研究,肥尾和瘦尾,分别适用哪些分布就是你笔记上总结的了,记住这个就好了
原版书上的描述是基于尾巴是肥尾的前提下,把尾巴拿出来单独研究这个尾巴的分布,得到的就是上面我发的那段话,比较笼统,你就记你自己的笔记就ok啦


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