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Question 284  covariance, correlation

The following table shows a sample of historical total returns of shares in two different companies A and B.

Stock Returns
Total effective annual returns
Year ##r_A## ##r_B##
2007 0.2 0.4
2008 0.04 -0.2
2009 -0.1 -0.3
2010 0.18 0.5
 

What is the historical sample covariance (##\hat{\sigma}_{A,B}##) and correlation (##\rho_{A,B}##) of stock A and B's total effective annual returns?



Question 285  covariance, portfolio risk

Two risky stocks A and B comprise an equal-weighted portfolio. The correlation between the stocks' returns is 70%.

If the variance of stock A increases but the:

  • Prices and expected returns of each stock stays the same,
  • Variance of stock B's returns stays the same,
  • Correlation of returns between the stocks stays the same.

Which of the following statements is NOT correct?



Question 293  covariance, correlation, portfolio risk

All things remaining equal, the higher the correlation of returns between two stocks:



Question 559  variance, standard deviation, covariance, correlation

Which of the following statements about standard statistical mathematics notation is NOT correct?



Question 561  covariance, correlation

The covariance and correlation of two stocks X and Y's annual returns are calculated over a number of years. The units of the returns are in percent per annum ##(\% pa)##.

What are the units of the covariance ##(\sigma_{X,Y})## and correlation ##(\rho_{X,Y})## of returns respectively?

Hint: Visit Wikipedia to understand the difference between percentage points ##(\text{pp})## and percent ##(\%)##.


Question 562  covariance

What is the covariance of a variable X with itself?

The cov(X, X) or ##\sigma_{X,X}## equals:



Question 564  covariance

What is the covariance of a variable X with a constant C?

The cov(X, C) or ##\sigma_{X,C}## equals:



Question 988  variance, covariance, beta, CAPM, risk, no explanation

Price Data Time Series
Sourced from Yahoo Finance Historical Price Data
Date S&P500 Index (^GSPC)   Apple (AAPL)
Open High Low Close Adj close   Open High Low Close Adj close
2007, Wed 3 Jan 1418 1429 1408 1417 1417 12.33 12.37 11.7 11.97 10.42
2008, Wed 2 Jan 1468 1472 1442 1447 1447 28.47 28.61 27.51 27.83 24.22
2009, Fri 2 Jan 903 935 899 932 932 12.27 13.01 12.17 12.96 11.28
2010, Mon 4 Jan 1117 1134 1117 1133 1133 30.49 30.64 30.34 30.57 26.6
 
Source: Yahoo Finance.
 

 

Which of the following statements about the above table which is used to calculate Apple's equity beta is NOT correct?




Copyright © 2014 Keith Woodward