sievers {npsm}

Doksum and Sievers rat data

Description

Doksum and Sievers (1976) describe an experiment involving the effect of ozone on weight gain of rats. The experimental group consisted of 22 rats which were placed in an ozone environment for seven days, while the control group contained 21 rats which were placed in an ozone-free environment for the same amount of time. The response was the weight gain in a rat over the time period.

Usage

data(sievers)

Format

A data frame with 45 observations on the following 2 variables.

group

indicator variable for treatment

weight.gain

response variable of weight gain

References

Hettmansperger, T.P. and McKean J.W. (2011), Robust Nonparametric Statistical Methods, 2nd ed., New York: Chapman-Hall.

Doksum, K. A. and Sievers, G. L. (1976), Plotting with confidence: Graphical comparisons of two populations, Biometrika, 63, 421-434.

Examples

data(sievers)
boxplot(weight.gain~group,data=sievers)