14.3 Suppose that in Problem 14.2, X is fully observed and Y has somemissing values. Show that ML estimates for the general location model cannot be found by factoring the likelihood, because the parameters of the appropriate factorization are not distinct. Suggest an alternative model for which the parameters of the factorization are distinct and display ML estimates for this model.

348 14 Mixed Normal and Nonnormal Data withMissing Values, Ignoring theMissingness Mechanism