Surv 	 	 Package a survival variable 
cluster 	 Identify clusters. 
cox.zph 	 Test the proportional hazards assumption of a Cox regression. 
coxph 	 	 Proportional Hazards Regression 
coxph.detail 	 Details of a cox model fit 
coxph.object 	 Proportional Hazards Regression Object 
coxph.rvar 	 Robust variance for a Cox model 
is.ratetable 	 Verify that an object is of class ratetable. 
lines.survfit 	 Add lines to a survival plot 
plot.cox.zph 	 Graphical test of proportional hazards 
plot.survfit 	 Plot method for survfit. 
print.survfit 	 Short summary of a survival curve 
pyears 	 	 Person Years 
residuals.coxph  Calculate residuals for a coxph fit. 
residuals.glm 	 Compute Residuals for survreg Objects 
rowsum 	 	 Give row sums of a matrix, based on a grouping variable. 
strata 	 	 Identify strata variables. 
summary.survfit  Print a Survival Curve 
survdiff 	 Test Survival Curve Differences 
survexp 	 Compute Expected Survival 
survexp.fit 	 Compute expected survival (not working)
survfit 	 Compute a survival Curve for Censored Data 
survfit.object 	 Survival Curve Object 
survobrien 	 Peter O'Brien's test for association of a single variable with survival 
survreg 	 Regression for a parametric survival model 
survreg.object 	 Parametric Survival Model Object 
survsum 	 Kaplan-Meier survival curve and percentages at selected times 
untangle.specials  Help process the 'specials' argument of the terms function. 
