extract_z function

Extracting the z-statistic from a survival object

Generic S3 methods to extract the z-statistic from a set of survival fit objects

extract_z(fit, ...)

## S3 method for class 'survdiff'
extract_z(fit, ...)

## S3 method for class 'coxph'
extract_z(fit, arm, ...)

## S3 method for class 'survreg'
extract_z(fit, arm, ...)

Arguments

• fit: a fitted survival object : survdiff, coxph, survreg
• ...: extendible arguments to the S3 method
• arm: a character vector giving the name of the covariate representing the treatment arm.

Returns

a numeric value, the z statistic for the independence test of the treatment arm

Methods (by class)

• extract_z(survdiff): Method for survdiff
• extract_z(coxph): Method for coxph objects
• extract_z(survreg): Method for survreg objects

Author(s)

Simon Bond