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消极小狗 · 2024年03月18日

我想问一下那什么情况适用于ewma呢

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。

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?

您的回答C, 正确答案是: A

A

GARCH(1,1) model.

B

Geometrically weighted historical volatility model.

C

不正确EWMA model.

D

Weighted historical volatility model.


这个题目选garch,我先问一下那题目给出什么条件的时候会选ewma呢

1 个答案

李坏_品职助教 · 2024年03月18日

嗨,爱思考的PZer你好:


本题是因为波动率的预估使用的是GARCH,为了保持consistent,所以协方差也必须和波动率保持一致的方法,都用GARCH。


如果是波动率的预估用了EWMA,那么协方差也应该用EWMA。此外,EWMA的适用情况是:随时时间距离现在越远,权重越低:

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