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临江仙 · 2021年02月01日

答案没看懂

NO.PZ2018122701000052

问题如下:

Risk analyst uses data from the HS300 index over the past 260 weeks to estimate the long-term average correlation of the common stocks and mean reverting rate. And find the average long-term stock correlation of the HS 300 Index is 22%, and the regression output estimates the following regression relationship: Y = 0.34-0.55X. Assume that in first week of March 2020, the average weekly correlation of all HS300 stocks was 65%. Based on the mean reverting rate in regression analysis, what is the estimated one-week autocorrelation?

选项:

A.

21.9%

B.

23%.

C.

35%

D.

45%

解释:

D is correct.

考点:Autocorrelation

解析:单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45

.

解析:单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45


.

李老说,如果是正的就是trending,所以是auto=0.55,然后回归系数是0.45?

————————————————————————————————————————————————

题目求的是autocorrelation,就是1-α。

但是αμ=0.34。根据μ求出α=1.55

1-α=-0.55。

后面为什么要再加上1,不懂,盼复

3 个答案

小刘_品职助教 · 2021年02月03日

同学你好,

久等了~

跟老师仔细确认了一下,你这样做是没有问题的,给你点赞!!

但是这道题题目本身有问题,如果是对的题目两个结果应该会是一样的。

考虑到经典题里也引述了这道题目,为了让同学了解之前的那个主要解法,所以暂且不勘误,敬请理解~

小刘_品职助教 · 2021年02月02日

小刘_品职助教 · 2021年02月02日

同学你好,

αμ=0.34。根据μ求出α=1.55 这一步是错误的,不能这么求

参考一下原版书上,是β=-均值回归率,所以均值回归率=0.55

然后单期自相关率=1-均值回归率=0.45

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NO.PZ2018122701000052 问题如下 Risk analyst uses ta from the HS300 inx over the past 260 weeks to estimate the long-term average correlation of the common stocks anmereverting rate. Anfinthe average long-term stocorrelation of the HS 300 Inx is 22%, anthe regression output estimates the following regression relationship: Y = 0.34-0.55X. Assume thin first week of Mar2020, the average weekly correlation of all HS300 stocks w65%. Baseon the mereverting rate in regression analysis, whis the estimateone-week autocorrelation? A.21.9% B.23%. C.35% 45% is correct.考点Autocorrelation解析单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45. No.PZ2018122701000052 (选择题)来源: 原版书Risk analyst uses ta from the HS300 inx over the past 260 weeks to estimate the long-term average correlation of the common stocks anmereverting rate. Anfinthe average long-term stocorrelation of the HS 300 Inx is 22%, anthe regression output estimates the following regression relationship: Y = 0.34-0.55X. Assume thin first week of Mar2020, the average weekly correlation of all HS300 stocks w65%. Baseon the mereverting rate in regression analysis, whis the estimateone-week autocorrelation?老师您好,我有点不明白这个-0.55的含义。在我的理解中,-0.55这个数字本身就代表了自相关系数是-.055。Y代表下一期的相关系数,X代表上一期的相关系数。为什么还需要计算呢。另外,题目告诉了我长期均值,那么0.34/0.22=1.55 = a,自相关系数=1-a = -0.55,这个结果我认为是佐证了上述对于 Y = 0.34-0.55X这个关系式的理解。但是答案不是这样理解的,所以我就有点困惑。希望老师能够帮我解答一下。谢谢!盼复

2022-12-17 11:42 1 · 回答

NO.PZ2018122701000052 问题如下 Risk analyst uses ta from the HS300 inx over the past 260 weeks to estimate the long-term average correlation of the common stocks anmereverting rate. Anfinthe average long-term stocorrelation of the HS 300 Inx is 22%, anthe regression output estimates the following regression relationship: Y = 0.34-0.55X. Assume thin first week of Mar2020, the average weekly correlation of all HS300 stocks w65%. Baseon the mereverting rate in regression analysis, whis the estimateone-week autocorrelation? A.21.9% B.23%. C.35% 45% is correct.考点Autocorrelation解析单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45. Y=0.34-0.55X 这个函数代表啥意思?怎么对应找a 呢?

2022-11-13 23:43 1 · 回答

NO.PZ2018122701000052 单期自相关率+均值回归率=1,这个结论哪里得来的?

2021-09-01 13:56 1 · 回答

NO.PZ2018122701000052 李老说,如果是正的就是trenng,所以是auto=0.55,然后回归系数是0.45?

2021-01-31 05:45 3 · 回答