Mode

Mode is the most frequent value in a dataset. For [1, 2, 2, 3, 4, 4, 4, 5] the mode is 4 (appears three times; nothing else does). It’s the only measure of central tendency that works for non-numeric data — the mode of [“red”, “blue”, “red”, “green”, “red”] is “red.”

Three special cases:

• Unimodal — exactly one most-frequent value. The standard case.
• Bimodal — two values tie for most-frequent. Implies a mixed-population distribution (e.g. heights of adult men + women combined produce a bimodal distribution).
• No mode — every value appears exactly once. The mode is technically undefined; some conventions report “no mode,” others report every value as a mode.

Use the mode when: the data is categorical (colours, brands, types) or you specifically care about the most common value, not the central tendency. For numerical data with no repeating values (heights, salaries) the mode is unhelpful — use mean or median.

Our statistics calculator reports the mode alongside mean and median, handling the bimodal case by listing all most-frequent values.