11.4. Describe the EM algorithm for bivariate normal data with means m1; m2, correlation r, and common variance s2, and an arbitrary pattern of missing

11.4. Describe the EM algorithm for bivariate normal data with means ðm1; m2Þ, correlation r, and common variance s2, and an arbitrary pattern of missing values. If you did Problem 11.2, modify the program you wrote to handle this model. (Hint: for the M step, transform to U1 ¼ Y1 þ Y2; U2 ¼ Y1  Y2.)