Consider the logistic-normal model (12.10) for the abortion opinion data, under the constraint = 0. a.

Consider the logistic-normal model (12.10) for the abortion opinion data, under the constraint σ = 0.

a. Explain why the fit is the same as an ordinary logit model treating the three responses for each subject as if they were independent responses for three separate subjects.

b. Fit the model. Interpret, and explain why {β̂_t – β̂_u} are quite different from those in Section 12.3.2 allowing σ > 0.