Refer to Table 11.13 on attitudes toward legalized abortion. For the response Yt(1=support legalization, 0=oppose.for question t (t=1, 2, 3.and for gender g (1=female, 0=male., consider the model logit[P(Yt=1)]=α+γg+βtwith β3=0.
a. A GEE analysis using unstructured working correlation gives correlation estimates 0.826 for questions 1 and 2, 0.797 for 1 and 3, and 0.832 for 2 and 3. What does this suggest about a reasonable working correlation structure?
b. Table 11.13 shows a GEE analysis with exchangeable working correlation. Interpret effects.
c. Treating the three responses for each subject as independent observations and performing ordinary logistic regression Give a heuristic explanation of why within-subject standard errors are much larger than with GEE, yet the between-subject standard error is smaller.
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