APPLE: Apple Hardness

In PASWR2: Probability and Statistics with R, Second Edition

Description

An experiment was undertaken where seventeen apples were randomly selected from an orchard (fresh) and measured for hardness. Seventeen apples were also randomly selected from a warehouse (warehouse) where the apples had been stored for one week and measured for hardness.

Usage

APPLE

Format

A data frame with 34 observations on the following two variables:

• hardness (hardness rating measured in \texttt{kg}/\texttt{meter}^2 for both the fresh and warehouse apples)

• location (factor with two levels fresh and warehouse)

References

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.

Examples

# ggplot2 approach
ggplot(data = APPLE, aes(sample = hardness)) + stat_qq() + facet_grid(. ~ location)
ggplot(data = APPLE, aes(sample = hardness, color = location)) + stat_qq()
ggplot(data = APPLE, aes(x = hardness, fill = location)) + geom_density(alpha = 0.4) + 
scale_fill_brewer()
# lattice approach
qqmath(~hardness|location, data = APPLE)
qqmath(~hardness, group = location, type = c('p', 'r'), auto.key = TRUE, data = APPLE)

PASWR2 documentation built on Sept. 5, 2021, 5:44 p.m.