## What is the purpose of R Bar Charts?

a) To compare the frequency or proportion of categories using rectangular bars

b) To plot the relationship between two continuous variables

c) To display the distribution of a single variable

d) To show time series data

### Answer:

a) To compare the frequency or proportion of categories using rectangular bars

### Explanation:

R bar charts are used to compare the frequency or proportion of categories using rectangular bars. The height or length of each bar represents the value of the corresponding category, making bar charts useful for comparing discrete variables or categorical data.

```
# Creating a bar chart in R
counts <- c(5, 10, 15, 20)
categories <- c("A", "B", "C", "D")
barplot(counts, names.arg = categories, col = "lightblue", main = "Bar Chart Example", ylab = "Frequency")
```

In this example, a bar chart is created with bars representing the frequency of four categories: A, B, C, and D. Bar charts are particularly useful for comparing the size of different groups, such as survey responses or sales figures.