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xyrg+ · 2023年01月27日

在课件哪里出现?

NO.PZ2019040801000066

问题如下:

Analyst Frank estimates the volatilities of two variables by using the GARCH(1,1) model. Now Frank plans to estimate covariance between the 2 variables. If Frank wants to generate a consistent correlation estimate between the 2 variables, which models will Frank most likely choose?

选项:

A.

GARCH(1,1) model.

B.

Geometrically weighted historical volatility model.

C.

EWMA model.

D.

Weighted historical volatility model.

解释:

A is correct.

考点:Estimating Correlations

解析:想保持一致性,协方差的预估方法就要选择与波动率预估相同的方法。因为这两个变量的波动率使通过GARCH(1,1)模型来预估的,所以应该选择一致的GARCH(1,1)模型。

在课件哪里出现?

1 个答案
已采纳答案

李坏_品职助教 · 2023年01月27日

嗨,努力学习的PZer你好:


这个在基础班讲义没有直接写出来,这里考查的是consistent,为了保持模型预估结果的一致性,应当尽可能选择同类的时间序列模型,前面已经用GARCH去预测波动率(标准差)了,那后面也应当保持一致。

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