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Statistics 101

Introduction
Arithmetic mean
Median
Mode
11. Mode – properties
Summary

Instruction

The mode is the least frequently used measure of central tendenct. It is most often used with non-numeric data, like names or nationalities.

In real-life datasets, a mode is insensitive to extreme observations. Extreme observations may have importance only in really small samples. Take a look at the following table:

Set Mode
1, 1, 1, 1, 1, 1, 1, 1 1
1, 1, 1, 1, 1, 1, 1, 9 1
1, 1, 1, 1, 1, 1, 1, 97 1
1, 1, 1, 1, 1, 1, 1, 997 1
1, 1, 1, 1, 1, 1, 1, -1003 1

In these examples, changing one element in any set doesn't change the mode. The arithmetic means would differ in this case, though.