galtonpeas: Galton's peas

In alr4: Data to Accompany Applied Linear Regression 4th Edition

Description

In a paper presented to the Royal Institute on February 9, 1877, Sir Francis Galton discussed his experiments on sweet peas in which he compared the sweet peas produced by parent plants to those produced by offspring plants. In these experiments he could observe inheritance from one generation to the next. Galton categorized the parent plants according to the typical diameter of the peas they produced.

Format

This data frame contains the following columns:

Parent

mean diameter of parent

Progeny

mean diameter of offspring

SD

offspring standard deviation

Source

Pearson, K. (1930). Life and Letters and Labours of Francis Galton, Vol IIIa. Cambridge: Cambridge University Press.

References

Weisberg, S. (2014). Applied Linear Regression, 4th edition. Hoboken NJ: Wiley.

Examples

head(galtonpeas)

Example output

Loading required package: car
Loading required package: carData
Loading required package: effects
lattice theme set by effectsTheme()
See ?effectsTheme for details.
  Parent Progeny    SD
1     21   17.26 1.988
2     20   17.07 1.938
3     19   16.37 1.896
4     18   16.40 2.037
5     17   16.13 1.654
6     16   16.17 1.594

alr4 documentation built on May 2, 2019, 2:13 p.m.