Accuracy and precision

Accuracy and precision are measurements within science and engineering of how well results fit with reality and how reliable they are. Accuracy is a concept that describes the degree to which a measurement approximates the actual value, whereas precision measures how reproducible a result is.

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Low accuracy or precision

An experiment or test with low accuracy or precision is still useful if the other is reasonably high. A test with low precision can be improved with more samples as each data point will still average out as an accurate value (diagram 1). On the other hand, a test with low accuracy can still be useful if it is precise, because we can conclude that there must be a reproducible and systematic error in the measurement causing the lack of accuracy (diagram 2). In science, this is particularly useful for refining theories and experiments.

Visual representation
gollark: https://osmarks.tk/pages.html#5466260 <- skip ahead to page 5466260
gollark: I think it's 2^53 or something, which is Big Enough™.
gollark: I mean, kind of. JS numbers are limited. I don't know exactly what the ceiling is before they're too messed-up to paginate properly.
gollark: Now, the average website has an infinite number of pages.
gollark: Infinite pages:https://osmarks.tk/pages.html

See also
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