Edgar Anderson’s Iris Data

Introduction

The famous (Fisher’s or Anderson’s) iris data set contains 150 observations of iris flowers and includes the following variables:

• sepal length
• sepal width
• petal length
• petal width
• species

Descriptive Statistics

The average sepal length, sepal width, petal length, and petal width across all observations are 5.8, 3.1, 3.8, 1.2 respectively. Additional descriptive statistics are detailed below:

	Sepal.Length	Sepal.Width	Petal.Length	Petal.Width	Species
	Min. :4.300	Min. :2.000	Min. :1.000	Min. :0.100	setosa :50
	1st Qu.:5.100	1st Qu.:2.800	1st Qu.:1.600	1st Qu.:0.300	versicolor:50
	Median :5.800	Median :3.000	Median :4.350	Median :1.300	virginica :50
	Mean :5.843	Mean :3.057	Mean :3.758	Mean :1.199	NA
	3rd Qu.:6.400	3rd Qu.:3.300	3rd Qu.:5.100	3rd Qu.:1.800	NA
	Max. :7.900	Max. :4.400	Max. :6.900	Max. :2.500	NA

Illustration

The following graphic illustrates the relationship between sepal length and petal length categorized by Iris species.

library(ggplot2)

ggplot(iris, aes(Sepal.Length, Petal.Length, color = Species)) +
        geom_point()