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Question 307  risk, variance

Let the variance of returns for a share per month be ##\sigma_\text{monthly}^2##.

What is the formula for the variance of the share's returns per year ##(\sigma_\text{yearly}^2)##?

Assume that returns are independently and identically distributed (iid) so they have zero auto correlation, meaning that if the return was higher than average today, it does not indicate that the return tomorrow will be higher or lower than average.



Question 308  risk, standard deviation, variance, no explanation

A stock's standard deviation of returns is expected to be:

  • 0.09 per month for the first 5 months;
  • 0.14 per month for the next 7 months.

What is the expected standard deviation of the stock per year ##(\sigma_\text{annual})##?

Assume that returns are independently and identically distributed (iid) and therefore have zero auto-correlation.



Question 559  variance, standard deviation, covariance, correlation

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



Question 560  standard deviation, variance

The standard deviation and variance of a stock's annual returns are calculated over a number of years. The units of the returns are percent per annum ##(\% pa)##.

What are the units of the standard deviation ##(\sigma)## and variance ##(\sigma^2)## of returns respectively?

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


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