GrapeFruit: Grape Fruit data from Preece (1982, Table 6)

In PairedData: Paired Data Analysis

Description

This dataset presents paired data corresponding to the percentage of solids recorded in the shaded and exposed halves of 25 grapefruits.

Usage

data(GrapeFruit)

Format

A dataframe with 25 rows and 3 columns:

[,1]	Fruit	numeric
[,2]	Shaded	numeric	percentage of solids in grapefruit
[,3]	Exposed	numeric	percentage of solids

Source

Croxton, F.E. & Coxden, D.J. (1955) Applied Genral Statistics, 2nd ed. Chapman and Hall, London.

References

Preece, D.A. (1982) t is for trouble (and textbooks): a critique of some examples of the paired-samples t-test. The Statistician, 31 (2), 169-195.

Examples

data(GrapeFruit)

# Visualizing a very strange paired distribution
with(GrapeFruit,plot(paired(Shaded,Exposed)))
with(GrapeFruit,plot(paired(Shaded,Exposed),type="BA"))
with(GrapeFruit,plot(paired(Shaded,Exposed),type="McNeil"))
with(GrapeFruit,plot(paired(Shaded,Exposed),type="profile"))

# As underlined by Preece (1982), have a look to
# the distribution of the final digits
show(GrapeFruit)
table(round((GrapeFruit$Shaded*10-floor(GrapeFruit$Shaded*10))*10))
table(round((GrapeFruit$Exposed*10-floor(GrapeFruit$Exposed*10))*10))

PairedData documentation built on May 1, 2019, 6:49 p.m.