R: Experiments with mouse

mouse.c {bootstrap} | R Documentation

## Experiments with mouse

### Description

A small randomized experiment were done with 16 mouse, 7 to treatment group and 9 to control group. Treatment was intended to prolong survival after a test surgery.

### Usage

    data(mouse.c)

### Format

The format is: num [1:9] 52 104 146 10 50 31 40 27 46

### Details

The treatment group is is dataset `mouse.t`. `mouse.c` is the control group. The book uses this example to illustrate bootstrapping a sample mean. Measurement unit is days of survival following surgery.

### Source

Efron, B. and Tibshirani, R. (1993) An Introduction to the Bootstrap. Chapman and Hall, New York, London.

### Examples

    str(mouse.c)
    if(interactive())par(ask=TRUE)
    stripchart(list(treatment=mouse.t, control=mouse.c))
    cat("bootstrapping the difference of means, treatment - control:\n")
    cat("bootstrapping is done independently for the two groups\n")
    mouse.boot.c <- bootstrap(mouse.c, 2000, mean)
    mouse.boot.t <- bootstrap(mouse.t, 2000, mean)
    mouse.boot.diff <- mouse.boot.t$thetastar - mouse.boot.c$thetastar
    hist(mouse.boot.diff)
    abline(v=0, col="red2")
    sd(mouse.boot.diff)

[Package bootstrap version 2019.6 Index]