Refer to Problem 15.2. Using these data, describe the differences between (a) WLS and ML, and (b) WLS and GEE methods for marginal models with multivariate categorical response data.

Data from Problem 15.2:

Use WL.S to conduct the longitudinal analysis of depression in Section 11.2.1. Using software (e.g., SAS: PROC CATMOD), obtain WLS estimates and standard errors and compare to the ML results.