2. Using the data from the W'HAS {i.e.. ignore cohort], with length of follow up as the survival time in.4.rial:-le and status at last follow up as the censoring variable, do the following: (a) Fit the proportional hazards model containing age centered at 65 years, sex. peak cardiac enzymes centered at 6-50. cardiac shock complications. left heart failure complications and MI order and obtain the estimated baseline survivorship func- tion. (Note: in this problem, ignore the possible sexx age interaction). Estimate hazard ratios {via point estimates and 95 percent condence intenals} for each variable in the model. (b) Using the method for modied risk score. compute and graph estimated survivor- ship functions for subjects with and without cardiogenic shock complications. Use the estimated survivorship functions to estimate the median survival time