Question: Using the “CHD outcomes” dataset:

Determine whether patients experience a significant change in functioning with increased time after surgery for CHD (variables “outcome1” through “outcome4” show patients’ level of functioning on a five-point scale, at months 1 through 4 after surgery).

Determine whether the amount of improvement in functioning that patients experience over time is related to pet ownership (yes/no).

Produce a graph that compares change in functioning over time for the pet owners and for the non-pet owners. Describe this graph in terms of the profile analysis concepts of flatness, parallelism, and differences between groups.

Does the interaction between pet ownership and amount of change over time remain significant after you control for patients’ marital status and age?