Program 9

Objective

Create multiple histograms using ggplot2::facet_wrap() to visualize how a variable (eg., Sepal.Length) is distributed across different groups (eg., Species) in a built-in R dataset.

step 1: load the required libraries

library(ggplot2)
#Load the iris dataset
data(iris)
#view the first few rows of the dataset
head(iris)

  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa

step 2: create histograms using facet_wrap for grouped data

ggplot(iris, aes(x=Sepal.Length))+
  geom_histogram(binwidth = 0.3, fill="skyblue", color = "black")+
  facet_wrap(~ Species)+
  labs(title="Distribution of Sepal Length by Species",
       x= "Sepal Length (cm)",
       y= "Frequency")+
  theme_minimal()