A **Venn diagram** is a diagram that uses overlapping circles to show the relationship between two groups.

A **proportional Venn diagram** is a specific type of Venn diagram in which the size of the circles represent the sample size of each group.

The easiest way to create a proportional Venn diagram in R is by using the **plot** function from the **eulerr** package.

The following example shows how to do so in practice.

**Example: How to Create a Proportional Venn Diagram in R**

Suppose we have two groups with the following values:

**A**: 100**B**: 500**A & B Overlap**: 75

To create a proportional Venn diagram to visualize the relationship between these two groups, we can use the following code:

library(eulerr) #specify values to use in venn diagram fit <- euler(c('A' = 100, 'B' = 500, 'A&B' = 75)) #create venn diagram plot(fit)

Notice that the sizes of the circles in the Venn diagram are representative of the values that we specified.

If you would like to customize the colors used in the Venn diagram, you can use the **fill** argument to do so:

library(eulerr) #specify values to use in venn diagram fit <- euler(c('A' = 100, 'B' = 500, 'A&B' = 75)) #create venn diagram with custom colors plot(fit, fill=c('coral2', 'steelblue'))

The A circle now has a **coral2** fill and the B circle now has a **steelblue** fill, just as we specified using the **fill** argument in the **plot** function.

**Note**: Refer to this page for a complete introduction to the **eulerr** package in R.

**Additional Resources**

The following tutorials explain how to create other common visualizations in R:

How to Create a Grouped Boxplot in R Using ggplot2

How to Create a Heatmap in R Using ggplot2

How to Create a Gantt Chart in R Using ggplot2