Grape Fruit data from Preece (1982, Table 6)

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:

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))