program 4

Develop a script in R to produce a bar graph displaying the fequency distribution of categorical data in a given dataset, grouped by a specific variable, using ggplot2

Loading necessary libraries

library(ggplot2)

Step1: Load the dataset

data <- mtcars
head(data)

                   mpg cyl disp  hp drat    wt  qsec vs am gear carb
Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

Step 2: Convert Numeric Data to Categorical

data$cyl <- as.factor(data$cyl)
data$gear <- as.factor(data$gear)

Step 4:create a bar graph

ggplot(data , aes(x= cyl, fill = gear)) +
  geom_bar(position = "dodge") +
  labs(title = "Frequency of Cylinders Grouped by Gear Type",
       x = "Number of cylinders",
       y ="count",
       fill = "Gears") +
  theme_minimal ()