Q&A 33 How do you visualize overlaps using a Venn diagram?

33.1 Explanation

A Venn diagram shows the overlap and differences between sets. It’s useful for comparing shared vs unique elements among groups.

• Works best for 2 or 3 sets
• Clearly shows commonality and uniqueness
• Use for membership, features, item inclusion

33.2 Python Code

from matplotlib_venn import venn2
import matplotlib.pyplot as plt

set1 = set(["A", "B", "C", "D"])
set2 = set(["C", "D", "E", "F"])

plt.figure(figsize=(6, 4))
venn2([set1, set2], set_labels=("Group 1", "Group 2"))
plt.title("Venn Diagram of Two Sets")
plt.show()

33.3 R Code

library(VennDiagram)

venn.plot <- draw.pairwise.venn(
  area1 = 4, area2 = 4, cross.area = 2,
  category = c("Group 1", "Group 2"),
  fill = c("lightblue", "pink"),
  ind = FALSE
)

grid.draw(venn.plot)

✅ Use Venn diagrams for small set-based comparisons when the goal is to highlight overlap, not quantity.