Problem bank

Problem 194 of 333HardStochastic CalculusP194

Mean and variance of the integral of W dW

  1. Let IT=∫0TWt dWtI_T = \int_0^T W_t\,dW_t (Itô). Find E[IT]E[I_T] and Var(IT)\mathrm{Var}(I_T). Check your variance with the Itô isometry. What is the standard deviation when T=2T = 2?