How can the unstructured correlation structure be
used to assess assumptions underlying other more
constrained correlation structures?
Estimate the odds ratio and 95% confidence interval
for DIARRHEA (1 vs. 0) using the model with the
stationary 8-dependent working correlation structure.
If the GEE approach yields consistent estimates of the
“true odds ratio” even if the correlation structure is
misspecified, why are the odds ratio estimates differ-
ent using a stationary 4-dependent correlation struc-
ture (Exercise 2) and a stationary 8-dependent
correlation structure (Exercise 8).
Suppose that a parameter estimate obtained from
running a GEE model on a correlated data set was
not affected by the choice of correlation structure.
Would the corresponding Wald test statistic also be
unaffected by the choice of correlation structure?
