We would like to do a step-by-step analysis of the BMACS data. The data are de- scribed in Section 1.2.2 (Example 1) of my book, “Nonparametric Models for Longitudinal Data: With Implementation in R,” Wu and Tian, 2018, Chapman & Hall/CRC, New York. In short, this dataset is from the Baltimore site of the Multi-center AIDS Cohort Study (BMACS), which included 283 homosexual men who were infected by the human immun- odeficiency virus (HIV) between 1984 and 1991. The covariates of this simple illustration dataset are age of HIV infection (age), smoking status coded as “always smokers (Smoke = 1)” and never smokers, and CD4 cell percent before HIV infection. The outcome we are interested in is the post infection CD4 percent. These variables were repeatedly observed between one to 14 times.
Part of the analysis for this BMAC data has been presented in Section 2.4.1 and a few other chapters of Wu and Tian (2018). We would like to perform some further detailed analyses of this dataset using different modeling schemes.
Specific Analysis for Model Construction:
In the following, you need to present the mathematical expressions of your models and assumptions, and provide justifications and possible scientific interpretations of your modeling approach. For analysis and justifications, you need to show some preliminary analysis (such as plots and summary statistucs). Check Verbeke and Molenberghs (2000, Chapter 3) and slides LME1 and LME3 (both available on Blackboard) for steps, rationales and presentations. Please present your R code and output, tabulate your results and write down the explanation of your findings.
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