Glossary Term
Standard Deviation
Performance MetricsEN
Definition
A measure of the range of values in a set of numbers. Standard deviation is a statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.
Extended Notes
Source: National Cancer Institute, NCI Thesaurus 26.09d, C53322. NCI definition, reproduced without modification under CC BY 4.0. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Also Known As
SDStandard Deviation