balanced.hazard.ratio {survcomp} | R Documentation

## Function to estimate the balanced hazard ratio through Cox regression

### Description

Function to compute the balanced hazard ratio for a risk group prediction.

### Usage

    balanced.hazard.ratio(x, surv.time, surv.event, alpha = 0.05,
    method.test = c("logrank", "likelihood.ratio", "wald"),
    ties = c("efron", "breslow", "exact"), weights, strat, ...)

### Arguments

`x` | a vector of risk group predictions.
`surv.time` | a vector of event times.
`surv.event` | a vector of event occurrence indicators.
`alpha` | alpha level to compute confidence interval.
`method.test` | ...
`ties` | ...
`weights` | ...
`strat` | ...
`...` | additional parameters to be passed to the `hazard.ratio` and the `coxph` functions.

### Details

The balanced hazard ratio is computed using the Cox model.

### Value

`balanced.hazard.ratio` | balanced hazard ratio estimate.
`coef` | coefficient (beta) estimated in the cox regression model.
`se` | standard error of the coefficient (beta) estimate.
`lower` | lower bound for the confidence interval.
`upper` | upper bound for the confidence interval.
`p.value` | p-value computed using the score (logrank) test whether the balanced hazard ratio is different from 1.
`n` | number of samples used for the estimation.
`coxm` | `coxph.object` fitted on the survival data and `x`.
`data` | list of data used to compute the balanced hazard ratio (`x`, `surv.time` and `surv.event`).

### Author(s)

Samuel Branders

### References

Branders, S. and Dupont, P. (2015) "A balanced hazard ratio for risk group evaluation from survival data", Statistics in Medicine, 34(17), pages 2528–2543.

### See Also

`hazard.ratio`, `coxph`, `coxph.object`

### Examples

    set.seed(12345)
    age <- rnorm(100, 50, 10)
    stime <- rexp(100)
    cens   <- runif(100,.5,2)
    sevent  <- as.numeric(stime <= cens)
    stime <- pmin(stime, cens)
    strat <- sample(1:3, 100, replace=TRUE)
    weight <- runif(100, min=0, max=1)
    balanced.hazard.ratio(x=age, surv.time=stime, surv.event=sevent, weights=weight,
      strat=strat)

[Package survcomp version 1.36.1 Index]