Try to find a single cutpoint by maximizing the hazard ratio or minimizing
the AIC.
Usage
findCutpointByCoxph(input.d, surv.formula)
Arguments
- input.d
input data, typically a matrix or data frame
- surv.formula
a formula of type Surv(time, status) ~ x, where
x is the variable of interest.
Value
best cutpoint as determined by different metrics. Returns NA
if surv.formula is not univariable, the variable is not numeric, or
there is no variation in the variable of interest.
Details
The formula must be univariable.
Warning
surv.formula cannot be multivariable. For example,
Surv(time, status) ~ x + age won't work but Surv(time, status) ~ x is fine.
Author
Samuel Leung, Derek Chiu