MATH377: Financial and Actuarial Modelling in R Tutorial 7
Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: daixieit
MATH377: Financial and Actuarial Modelling in R
Tutorial 7
Exercise 1. Stocks A and B have the following joint probability distribution:
Probability |
Return on Stock A (RA) |
Return on Stock B (RB) |
0.1 |
10% |
35% |
0.2 |
2% |
5% |
0.4 |
12% |
20% |
0.2 |
20% |
25% |
0.1 |
38% |
45% |
Table 1: Joint probability distribution for stocks A and B
a) Compute the expected returns on stocks A and B.
c) Consider a portfolio made of 40% of stock A and 60% of stock B. Compute the expected value and standard deviation for the return on this portfolio.
e) What is the minimal variance portfolio? What is the expected return on the minimal variance portfolio?
Exercise 2. Consider three stocks A, B and C with expected rates of return E[RA] = 20%, E[RB] = 15%, and E[RC] = 10%. Moreover, the covariance matrix of the three stocks is:
|
RA |
RB |
RC |
RA |
0.36 |
0.084 |
0.105 |
RB |
0.084 |
0.1225 |
0.07 |
RC |
0.105 |
0.07 |
0.0625 |
Table 2: Covariance matrix
Using these three stocks, an investor would like to create a portfolio with an expected return of 16% and minimum risk (measured as the standard deviation of the return).
a) What is the standard deviation of the portfolio’s return?
b) Find the weights of the portfolio.
Exercise 3. Consider stocks A, B and C with expected rates of return E[RA] = 0.0427, E[RB] = 0.0015, and E[RC] = 0.0285, and covariance matrix
|
RA |
RB |
RC |
RA |
0.01 |
0.0018 |
0.0011 |
RB |
0.0018 |
0.0109 |
0.0026 |
RC |
0.0011 |
0.0026 |
0.0199 |
Table 3: Covariance matrix
a) Find the mean and variance of the return of an equally weighted portfolio.
b) Plot the opportunity set. Note: use values between 3 and -3 for wA and wB .
c) Assuming that Rf = 0.02, plot the capital market line.
d) Find the weights of the optimal risky portfolio.
e) Find the mean and standard deviation of the optimal risky portfolio’s return.
2022-05-11