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轩羊羊 · 2023年01月30日

Chang excludes the volatility risk factor because the model has a higher R2 when including the credit risk rather than the volatility risk.

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NO.PZ202206260100000301

问题如下:

Is Chang most likely correct in his construction and conclusion of the linear factor model?

选项:

A.Yes, he is correct. B.No, he is incorrect with regard to attributing unexplained returns. C.No, he is incorrect with regard to dropping volatility as a risk factor.

解释:

Solution

B is correct. Chang concludes unexplained returns are attributable to alpha or random error and neglects to recognize that omitted risk factors also contribute to unexplained returns. For example, other risk factors, such as currency, are not included in this model, which could help explain returns and further increase R2.

A is incorrect. Chang was wrong in his conclusion regarding unexplained returns.

C is incorrect. Chang was correct to drop the volatility risk factor because of the multicollinearity problem, and including credit risk results in a higher R2 for the model.

这句话如何理解?

1 个答案
已采纳答案

伯恩_品职助教 · 2023年01月30日

嗨,爱思考的PZer你好:


Chang 得出结论,无法解释的回报可归因于 alpha 或随机误差,但是没用提到如果是omitted risk factors也会导致无法解释的回报。例如,货币factor,不包括在该模型中,这可能有助于解释回报并进一步增加 R2

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