jdata {npordtests}

Jonckheere's data

Description

This synthetic data is reported by Jonckheere (1954). The data consists of 4 groups with 4 observations in each.

Usage

jdata

Format

A data frame with 16 observations on the following 2 variables.

X

Number of samples

Y

Value

Source

Jonckheere, A. R. (1954). A Distribution-Free k-Sample Test Against Ordered Alternatives. Biometrika, 41, 133-145.

Examples

library(npordtests)

data(jdata)
levels(jdata$X) <- c("I", "II", "III", "IV")
boxplot(Y~X,data=jdata,xlab="Groups")