the matrix. The 7th diagonal of the FI is . The other entries in the 7th row and column of the FI are zero. The asymptotic variance of the tensor estimator is the upper left 6x6 part of the inverse of the FI, which is extracted by applying a contrast matrix C to give . An application of the multivariate delta method (2) shows that a continuously differentiable function of the tensor estimator is consistent and asymptotically normal. This method applies to vector-valued functions of the tensor as well as scalar functions. We apply the delta method to show that the FA estimator is consistent and asymptotically normal. Express the FA estimator as , where FA expressed in terms of the tensor elements is . Then, , where . These partial derivatives are