PwrGSD: Ch13-mysurvfit – R documentation

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PwrGSD

Ch13-mysurvfit

My Survfit

Description

Computes numbers at risk, numbers of events at each unique event time within levels of a blocking factor

Usage

mysurvfit(formula = formula(data), data = parent.frame(), subset, na.action = na.fail)

Arguments

`formula`	Should be a formula of the form `Surv(ti, ev) ~ block` where `block` is the blocking factor. It need not be a factor per se but should have relatively few discrete levels. Sorry, no staggered entry allowed at present
`data`	a dataframe
`subset`	you can subset the analysis via logical expression in variables in the dataframe
`na.action`	pass a method for handling `NA` values in `block` such as `na.omit`, or `na.fail`

Value

A dataframe of 2*NLEV + 1 columns where NLEV is the number of levels of the factor block.

`time`	The sorted vector of unique event times from all blocks
`nrisk1`	The number at risk in block level 1 at each event time
`nevent1`	The number of events in block level 1 at each event time
`...`
`nriskNLEV`	The number at risk in block level NLEV at each event time
`neventNLEV`	The number of events in block level NLEV at each event time

Author(s)

Grant Izmirlian <izmirlian@nih.gov>

Examples

library(PwrGSD)
  data(lung)

  fit.msf <- mysurvfit(Surv(time, I(status==2)) ~ sex, data=lung)

  fit.msf
  ## Not run: 
  plot(fit.msf)
  
## End(Not run)

PwrGSD

Power in a Group Sequential Design

v2.3.3

GPL (>= 2)

Authors

Grant Izmirlian <izmirlig@mail.nih.gov>

Initial release

Ch13-mysurvfit

Description

Usage

Arguments

Value

Author(s)

Examples

PwrGSD

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