vcdExtra (version 0.8-5)

Gilby: Clothing and Intelligence Rating of Children

Description

Schoolboys were classified according to their clothing and to their teachers rating of "dullness" (lack of intelligence), in a 5 x 7 table originally from Gilby (1911). Anscombe (1981) presents a slightly collapsed 4 x 6 table, used here, where the last two categories of clothing were pooled as were the first two categories of dullness due to small counts.

Both Dullness and Clothing are ordered categories, so models and methods that examine their association in terms of ordinal categories are profitable.

Usage

data(Gilby)

Format

A 2-dimensional array resulting from cross-tabulating 2 variables for 1725 observations. The variable names and their levels are:

No	Name	Levels
1	Dullness	"Ment. defective", "Slow", "Slow Intell", "Fairly Intell", "Capable", "V.Able"
2	Clothing	"V.Well clad", "Well clad", "Passable", "Insufficient"

References

Gilby, W. H. (1911). On the significance of the teacher's appreciation of general intelligence. Biometrika, 8, 93-108 (esp. p. 94). [Quoted by Kendall (1943,..., 1953) Table 13.1, p 320.]

Examples

data(Gilby)

# CMH tests treating row/column variables as ordinal
CMHtest(Gilby)

mosaic(Gilby, shade=TRUE)

# correspondence analysis to see relations among categories
if(require(ca)){
	ca(Gilby)
	plot(ca(Gilby), lines=TRUE)

}