Runs the log-rank test and Breslow test to test for difference between two or
more survival curves.
Usage
grhoTests(formula, data, digits = 4)
Arguments
- formula
formula expression of the form Surv(time, status) ~ predictors
- data
data frame where variables from formula originate
- digits
number of significant digits to retain
Value
The Chi-Square statistic, degrees of freedom, and p-value are given
for both G-rho tests.
Details
The log-rank test corresponds to rho = 0 and the Breslow test
corresponds to rho = 1 in survdiff. This function emulates the
"Overall Comparisons" table output from SPSS.
Examples
library(survival)
grhoTests(Surv(futime, fustat) ~ rx, data = ovarian)
#> Chi-Square df Sig.
#> Log Rank (Mantel-Cox) 1.063 1 0.3026
#> Breslow (Generalized Wilcoxon) 1.685 1 0.1943