1. Day 7 Survival Analysis

2. CHD and coffee Is there an association between CHD and coffee consumption? Outcome: Time to onset of CHD

3. Survival Data in Stata stset chdage chd Generally, –stset failtime cens –where cens = 0 if failure is NOT observed

4. Kaplan Meier Survival Curves sts graph sts graph, noorigin yasis atrisk sts graph, noorigin censored(multiple) sts graph, by(cafe) yline(0.70,0.80,0.90,1) sts graph, by(cafe) noorigin cens(mult)

5. Testing Equality of Survival Curves Logrank Test –sts test cafe –sts test cholcat –sts test cholcat2 Wilcoxon –sts test café, wilco

6. Listing Survival Statistics sts list sts list, by(cafe) compare

7. Cox Proportional Hazards Model Gives relative risk, defined as hazard ratio E.g., tells increased risk for coffee drinkers for any given age. –stcox cafe –stcox cholcat2 –stcox cafe cholcat2 basesmoke