15.39.* For a two-way contingency table, let ri denote the ith row total, let cj denote the jth column total, and let n denote the total sample size. Section 8.2 (page 218) stated that the cell in row i and column j has fe = ricj/n for the independence model. Show that the log of the expected frequency has an additive formula with terms representing the influence of the ith row total, the jth column total, and the sample size. This formula is the loglinear model for independence in two-way contingency tables.