代写MATH 262 Financial Mathematics Second semester 2023-2024 Exercises Sheet 4代写留学生Matlab语言
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Financial Mathematics
MATH 262
Exercises Sheet 4
Exercise 1
The table below provides a probability distribution for the rates of return (r.o.r.) on stocks A , B and C.
State |
Probability |
r.o.r. on A |
r.o.r. on B |
r.o.r. on C |
1 |
0.10 |
10% |
10% |
35% |
2 |
0.30 |
25% |
− 10% |
15% |
3 |
0.30 |
5% |
30% |
10% |
4 |
0.30 |
15% |
15% |
5% |
What is the expected rate of return on stocks A, B and C?
Exercise 2
We consider the same stocks introduced in Exercise 1. Find the variance on stock A, stock B and stock C.
Exercise 3
We consider again the same stocks introduced in Exercise 1. Let p1 be a portfolio consisting of 25% stock A, 30% stock B and 45% stock C, and let p2 be a portfolio consisting of stock A and stock B with weights wA (min) and wB (min) respectively (it is the minimum-variance portfolio).
(1) What is the expected rate of return on the portfolio p1 ?
(2) What is the variance on the portfolio p1 ?
(3) Compute wA (min).
Exercise 4
Consider a portfolio p consisting of Stock A with weight w1 and stock B with weight w2 where
1) Stock A : ˆ(r)1 = 10% and σ1 = 12%.
2) Stock B : ˆ(r)2 = 15% and σ2 = 20%.
3) Correlation between rates of return ρ = − 1.
Using the definitions in Chapter 2 (Diversification), we have ˆ(r)p = w1 ˆ(r)1 + w2 ˆ(r)2 and w2 = 1 − w1 , so we deduce the linear relationship
ˆ(r)p =ˆ(r)p(w1 ) =ˆ(r)2 + w1 (ˆ(r)1 − ˆ(r)2 ) , (1)
between the weight of stock A and the expected rate of return on the portfolio. We have also the (w1 ,σp) relationships described by the relation
σp(w1 ) = ‘w1(2)σ 1(2) + 2w1 (1 − w1 )Cov (r1 , r2 ) + (1 − w1 )2 σ2(2). (2)
By combining (1) and (2) find a relationship between the portfolio standard deviation σp and its expected rate of return ˆ(r)p.