In the ACTG 019 data, treatment rx is coded ZDV = 1 and placebo = 0. Define a new variable rxplus11 which is coded ZDV = 12 and placebo = 11; this can be done using the Stata command generate...

In the ACTG 019 data, treatment rx is coded ZDV = 1 and placebo = 0. Define a new variable rxplus11 which is coded ZDV = 12 and placebo = 11; this can be done using the Stata command generate rxplus11=rx+11. Fit a Cox model with rxplus11 as the only predictor, then fit a second Cox model with rx as the only predictor. How do the two results compare?