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%
0.16%
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