Refer to the crossover study in Problem 12.7. Kenward and Jones (1991) reported results using the ordinal response scale (none, moderate, complete) for relief. Explain how to formulate an ordinal logit random effects model for these data analogous to model (12.19).

Data from Problem 12.7:

For the crossover study in Table 11.10 (Problem 11.6), fit the model

logit[P(Y_i(k)t = 1|u_i(k))] = α_k + β_t + u_i(k),

where {u_i(k)} are independent N(0, σ²). Interpret {β̂_t} and σ̂.

Table 11.10: