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Published byMalachi Emory Modified over 2 years ago

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Day 7 Survival Analysis

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

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

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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)

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

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

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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

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