Consider the linear stochastic differential equation Show that the mean E[r(t)] is governed by the following deterministic

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Consider the linear stochastic differential equation 

dr(t) = [a(t)r(t) + b(t)] dt + p(t) dz(t).

Show that the mean E[r(t)] is governed by the following deterministic linear differential equation:

d dt -E[r(t)] = a(t) E[r(t)]+b(t),while the variance var(r(t)) is governed by

d dt -var(r(t)) = 2a(t)var(r(t))+p(t).

When the results are applied to the CIR interest rate model:

dr(t) = a[y - r(t)]dt + pr(t) dz(t),show that E[r(T)|r(t)] and var(r(T)|r(t)) are given by (7.2.30a,b). 

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