Statistics How To

Euler Diagram: How to Draw one in Easy Steps

Probability and Statistics > Probability > How to Create an Euler Diagram

Euler diagram: Overview

An Euler diagram is similar, but not the same as, a Venn diagram. While they both use circles to create diagrams, there’s a major difference: Venn diagrams represent an entire set, while Euler diagrams can represent a part of a set. A Venn diagram can have a shaded area to show an empty set. That area in an Euler diagram could simply be missing from the diagram altogether. Euler diagrams are difficult to draw by hand (a simple one is outlined below). You’re probably better off using software to create one like Smart Draw or Venn Master.

Euler diagram: Steps

Sample question: Draw an Euler diagram to represent the following statements:
All wizards can do magic.
No lizards can do magic.
No wizard is a lizard.

Step 1: Draw three circles to represent the three categories (wizard, lizard, magic). Overlap them all (use a pencil or software so you can move the circles later):
euler diagram 1

Step 2: Read the first statement and move the corresponding circle accordingly. “All wizards can do magic” must mean that the entire wizard circle has to be inside the magic circle.
euler diagram 2

Step 2: Read the second statement and move the corresponding circle accordingly. “No lizards can do magic” must mean that the entire lizard circle has to be outside the magic circle.
euler diagram 2

Step 3: Read the third statement and move the corresponding circle accordingly. “No wizards are lizards” must mean that the entire lizard circle has to be outside the wizard circle. In this case, the graph already has the lizard circle outside the wizard circle, so we’re done!

Reference:
University of Kent . Retrieved October 19th, 2015.

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