how to draw paired boxplot in R

To draw paired boxplots in R, you can use the `ggplot2` package. Here is an example code:

library(ggplot2)

# create sample data
data <- data.frame(
  group = rep(c("A", "B"), each = 50),
  value = c(rnorm(50, 10, 2), rnorm(50, 12, 2))
)

# plot paired boxplot
ggplot(data, aes(x = group, y = value, fill = group)) +
  geom_boxplot() +
  labs(title = "Paired Boxplot", x = "Group", y = "Value")

This code will create a paired boxplot with two groups labeled as "A" and "B". The `geom_boxplot()` function from `ggplot2` is used to create the boxplots. The `fill` parameter in `aes()` is used to fill the boxes with different colors for each group. The `labs()` function is used to add a title and axis labels to the plot.