1. An analyst gathered information about three economic variables, He noted that whenever variable A increased by one unit, variable B increased by 0.6 units but variable C decreased by 0.6 units. The correlation between variables A and B and the correlation between variables A and C respectively, are closest to:

 

 

Correlation between variables A and B

Correlation between variables A and C

A

0.6

-1.0

B

1.0

-1.0

D

1.0

-0.6

 

        Correct answer =B 
        Calculate and interpret a sample covariance and a sample correlation coefficient. The relationship between variables A and B is perfect positive correlation (1.0) and the relationship between variables A and C is perfect negative correlation (-1.0).

        CORRELATION的含义是什么?a增长1时b增长0.6 他们的相关系数为什么不是0.6? 因为根据题目的意思,是在判断A和B,A和C的相关系数,相关系数是指两者的变化方向,而不是两者的变化幅度关系,如果在两个变量的变化过程中,A上升时,B总是上升,或者A下降时,B总是下降,说明A和B是完全正相关;否则,完全负相关。 题目中的0.6是指两者的变化幅度之间的变化,是指一个变量变化一个单位,另一个变量变化是前一个变量的几倍,这是指Beta系数。 Beta=Cov(A,B)/var(B)=相关系数×标准差(A)/ 标准差(B)

 

        2. An  analyst gathered the following information ($ millions) about the performance  of a portfolio:
  

Quarter

Value at      Beginningof Quarter
          (prior to inflow or outflow)

Cash Inflow      (Outflow)
          At Beginning of Quarter

Value at End of      Quarter

1

2.0

0.3

2.4

2

2.4

0.2

2.6

3

2.6

(0.3)

3.2

4

3.2

1.0

4.0


        The portfolio's  annual time-weighted rate of return is closest to:
        A.18%.
        B.  29%.
        C.  38%.
        Correct answer = C
        The time-weighted rate of return is calculated by  computing the quarterly holding period returns and linking those returns into  an annual return:
        1.0435 x 1 x 1.3913 x 0.9524 = 1.3827
        1.3827 - 1 = 0.3827 or 38.2%
        提问:各个季度的收益率是怎么计算出来的 题中的cash flow(outflow) at beginning of quarter是什么意思 是股利吗???关于cash flow(outflow) at beginning of quarter是指Cash flow是指流入的现金流,为正,outflow是指流出的现金流,为负; 因为是在每一季度开始的时候有的cash inflow和cash outflow,所以应该把cash flow加在起初的value上。 Quarter 1: HPR = 2.4 / (2.0 + 0.3) = 1.0435(期初的价值为2,又流入了0.3,所以期初为2.3) Quarter 2: HPR = 2.6 / (2.4 + 0.2) = 1Quarter 3: HPR = 3.2 / (2.6 – 0.3) = 1.3913(期初的价值为2.6,又流出了0.3,所以期初为2.6-0.3=2.3) Quarter 4: HPR = 4.0 / (3.2 + 1.0) = 0.9524time-weighted rate of return = 1.0435 x 1 x 1.3913 x 0.9524-1= 1.3827-1=38.2%这题给的是季度收益率,而不是年化的,所以不用开3次方。
 

  
  扫一扫微信,*9时间获取2014年CFA考试报名时间和考试时间提醒
  
  
  高顿网校特别提醒:已经报名2014年CFA考试的考生可按照复习计划有效进行!另外,高顿网校2014年CFA考试辅导高清网络课程已经开通,通过针对性地讲解、训练、答疑、模考,对学习过程进行全程跟踪、分析、指导,可以帮助考生全面提升备考效果。

  报考指南:2014年CFA考试备考指南
  免费题库:2014年CFA免费题库
  考前冲刺:CFA备考秘籍
  高清网课:CFA考试网络课程