Question: For the insomnia study (Table 9.2), the transitional model (9.1) compared treatments while controlling for initial time to fall asleep. a. Add an interaction term

For the insomnia study (Table 9.2), the transitional model (9.1) compared treatments while controlling for initial time to fall asleep.

a. Add an interaction term to model (9.1). Summarize how the estimated treatment effect varies according to the initial responses.

b. Now treat the initial response as qualitative. Find and interpret the estimated treatment log odds ratio, fitting models that (i) assume no interaction, (ii) allow interaction. Interpret.

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