Value-at-Risk Theory and Practice

The first advanced book on value-at-risk

Chapter 3, Page 140
Exercise 25

Answer the following questions. If the answer is some nonstandard distribution or cannot be determined from the information provided, say so.

a. If N ~ N(1, 4), how is M = 3N + 5 distributed?

b. If L ~ (1, 3), how is G = log(L) distributed?

c. If N ~ N(2, 6), how is E = eN distributed?

d. If N1 ~ N(0, 9) and N2 ~ N(2, 1) have correlation 0.3, how is M = N1 + 3N2 distributed?

e. If N1 ~ N(1, 1) and N2 ~ N(0, 4) are independent, how is M = 2N1 + N2 distributed?

f. If N ~ N(0, 1), how is H = N 2 distributed?

g. If N1 ~ N(0, 1) and N2 ~ N(0, 1) are independent, how is distributed?

h. If X ~ (1, 0), how is C = distributed?

Solution

a. By [3.81], M ~ N(8, 36).

b. By [3.91] and [3.92], L ~ .

c. By [3.87] and [3.88], E ~ (e5, e16e10).

d. We cannot say. We are not told if N1 and N2 are joint-normal.

e. Because N1 and N2 are independent, they are joint-normal. Hence, M is normal. By [3.27] and [3.28], M ~ N(2, 6).

f. H ~ (1, 0)

g. H ~ (2, 25)

h. This is a nonstandard distribution. It is clearly not normal because C is strictly positive.

 

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