# summary.coxedExpdur: The mean or median expected duration In coxed: Duration-Based Quantities of Interest for the Cox Proportional Hazards Model

## Description

This function takes the output of `coxed` and calculates the mean or median of the expected durations across the observations for which durations are estimated.

## Usage

 ```1 2``` ```## S3 method for class 'coxedExpdur' summary(object, stat = "mean", ...) ```

## Arguments

 `object` The output from `coxed`. If `newdata2=NULL`, so that `coxed` is being used to predict duration instead of to calculate a marginal effect, then the class of the `coxed` output will be "`coxedExpdur`" and this function will be called by the generic `summary` function `stat` Either `"mean"` or `"median"` `...` For future methods

## Details

If `bootstrap=TRUE` in the call to `coxed` then a bootstrapped standard error and confidence interval is reported for the given statistic as well.

## Value

A scalar containing the mean or median duration, or a vector that also includes the bootstrapped standard error and confidence interval for this quantity.

## Author(s)

Jonathan Kropko <jkropko@virginia.edu> and Jeffrey J. Harden <jharden2@nd.edu>

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17``` ```require(survival) mv.surv <- Surv(martinvanberg\$formdur, event = rep(1, nrow(martinvanberg))) mv.cox <- coxph(mv.surv ~ postel + prevdef + cont + ident + rgovm + pgovno + tpgovno + minority, method = "breslow", data = martinvanberg) summary(mv.cox) # NPSF method ed1 <- coxed(mv.cox, method="npsf") ed1\$baseline.functions ed1\$exp.dur summary(ed1, stat="mean") summary(ed1, stat="median") ed1 <- coxed(mv.cox, method="npsf", bootstrap = TRUE) ed1\$exp.dur summary(ed1, stat="mean") summary(ed1, stat="median") ```

coxed documentation built on Aug. 2, 2020, 9:07 a.m.