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甜甜 · 2025年02月26日

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NO.PZ202208220100000509

问题如下:

Based on the output for Logistic Regression 1 and the information in the table above, which of the following alternatives is closest to the change in the probability that an ETF will be a winning fund if its price-to-earnings ratio increases by one unit and all else stays constant?

选项:

A.

17.0%

B.

0.16%

C.

1.5%

解释:

B is correct. Keeping all the independent variables’ average values ffxed and increasing the P/E value by 1, from 15.1743 to 16.1743, yields the new probability.


From the previous question, we know that the marginal probability is 5.67%. Therefore, the marginal increase in the probability of an average ETF being a winner went up 5.82% − 5.67% = 0.15%. A one-unit change in the P/E of an ETF will increase the probability of it becoming a winning fund by 0.15%, and therefore, B is the closest answer.

这题为啥不能log(p/1-p)=coefficient 算概率

1 个答案

品职助教_七七 · 2025年02月26日

嗨,爱思考的PZer你好:


log odds直接等于coefficient 是此前教材的算法。但这种方式争议很大,现在教材已经给删除了。

目前教材对于“change in the probability”统一都是先算出来一个新的probability,然后再减去旧的probability。


题库里目前还有零星几个case的小题还考察此前教材的算法(因为单独的小题没法删),遇到后忽略即可。

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