The
iris
data set is array containing 4 measurements
on 50 flowers from each of 3 species of iris.
Sepal length and width, and petal length
and width are measured in centimeters.
Species are Setosa, Versicolor, and Virginica.
The
iris.df
data set is same iris data but as a data frame.
The columns are the four measurements with names:
"Sepal.Length", "Sepal.Width", "Petal.Length"
and
"Petal.Width"
.
A fifth column,
"Species",
is a factor that identifies
the species:
"setosa", "versicolor", "virginica".
The
iris.df
data set matches the
iris
data set in R.
R. A. Fisher,
"The Use of Multiple Measurements in Taxonomic Problems",
Annals of Eugenics,
7, Part II, 1936, pp. 179-188.
Republished by permission of Cambridge University Press.
The data were collected by
Edgar Anderson,
"The irises of the Gaspe Peninsula",
Bulletin of the American Iris Society,
59, 1935, pp. 2-5.