6.1. Consider the L x L model (6.2), scaling row scores and column scores to have means of zero and standard deviations of 1. Express the model as a probability function for the cell probabilities {ðí;}, and demonstrate the similarity of this function with the bivariate normal density having unit standard deviations and correlation p. Show that the association parameter

â corresponds to p/(l - p2) (Goodman 1981a,b, 1985).