Bartlett: Bartlett data on plum root cuttings

In vcdExtra: 'vcd' Extensions and Additions

Description

In an experiment to investigate the effect of cutting length (two levels) and planting time (two levels) on the survival of plum root cuttings, 240 cuttings were planted for each of the 2 x 2 combinations of these factors, and their survival was later recorded.

Bartlett (1935) used these data to illustrate a method for testing for no three-way interaction in a contingency table.

Usage

data(Bartlett)

Format

A 3-dimensional array resulting from cross-tabulating 3 variables for 960 observations. The variable names and their levels are:

No	Name	Levels
1	Alive	"Alive", "Dead"
2	Time	"Now", "Spring"
3	Length	"Long", "Short"

Source

Hand, D. and Daly, F. and Lunn, A. D.and McConway, K. J. and Ostrowski, E. (1994). A Handbook of Small Data Sets. London: Chapman & Hall, p. 15, # 19.

References

Bartlett, M. S. (1935). Contingency Table Interactions Journal of the Royal Statistical Society, Supplement, 1935, 2, 248-252.

Examples

data(Bartlett)

fourfold(Bartlett, mfrow=c(1,2))

mosaic(Bartlett, shade=TRUE)
pairs(Bartlett, gp=shading_Friendly)

Example output

Loading required package: vcd
Loading required package: MASS
Loading required package: grid
Loading required package: colorspace
Loading required package: gnm

vcdExtra documentation built on May 31, 2017, 4:57 a.m.