Figures 3.2 and 3.3 present the correlation matrices for the actual and simulated data sets. The correlation patterns are well preserved in the simulated data though the strength of the associations is slightly less. Again, the Iman-Conover method approximates the desired rank correlations.

      Figure 3.2: Rank-correlation Matrix for Actual REFLECTIONS Data

      Figure 3.3: Rank-correlation Matrix for Simulated REFLECTIONS Data

      In addition to the visit-wise simulated REFLECTIONS data described previously (used for Chapters 11 and 12), we created a one observation per patient version of the data set with variables as shown in Table 3.5. This is referred to as the REFL data set and is used in Chapters 4–6 and 8–10.

      Table 3.5: REFL Data Set Variables

Variable Name	Variable Label
SubjID	Subject Number
Cohort	Cohort
Gender	Gender
Age	Age in years
BMI_B	BMI at Baseline
Race	Race
Insurance	Insurance
DrSpecialty	Doctor Specialty
Exercise	Exercise
InptHosp	Inpatient hospitalization in last 12 months
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