# Alex Peek blog

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Wednesday, July 25, 2018

## What is a measurement?

Photo source: Wikimedia Commons, Lite

Photo license: CC BY-SA 3.0

What is a measurement? Here is my definition:

A measurement a numerical observation based on a standard unit

What's the difference between a measurement and a statistic? Although measurements and statistics both rely on standard units and numbers, I believe the difference has to do with observation. Measurements are discovered in a single instance, whereas most statistics are not necessarily derived from a single instance. For example, take the statistic that Willie Mays hit 660 career home runs. This is not a measurement, because it wasn't discovered in a single observation.

License: CC BY-SA 4.0