Survival curves analysis of covariance
calogrank.Rd
Logrank test to compare survival curves adjusting for covariates
Arguments
- ftime
failure times
- fstatus
status indicator
- grp
group indicator
- cvt
continuous covariates used for adjusted analysis
- strat
stratification variable
Details
calogrank is the covariate adjusted version of k-sample survdiff. The function in its current form only does basic error checking.
References
Heller G. and Venkatraman E.S. (2004) A nonparametric test to compare survival distributions with covariate adjustment. JRSS-B 66, 719-733.
Examples
if (FALSE) library(survival)
data(pbc)
#> Warning: data set ‘pbc’ not found
pbc1 <- pbc
#> Error in eval(expr, envir, enclos): object 'pbc' not found
pbc1$trt[pbc1$trt == -9] <- NA
#> Error in pbc1$trt[pbc1$trt == -9] <- NA: object 'pbc1' not found
pbc1$copper[pbc1$copper == -9] <- NA
#> Error in pbc1$copper[pbc1$copper == -9] <- NA: object 'pbc1' not found
calogrank(pbc1$time, pbc1$status, pbc1$trt, pbc1[,c("copper")])
#> Loading required namespace: survival
#> Error in calogrank(pbc1$time, pbc1$status, pbc1$trt, pbc1[, c("copper")]): object 'pbc1' not found
calogrank(pbc1$time, pbc1$status, pbc1$trt,
pbc1[,c("protime", "copper")])
#> Error in calogrank(pbc1$time, pbc1$status, pbc1$trt, pbc1[, c("protime", "copper")]): object 'pbc1' not found