Stub entry: single definition derived from the NIST trustworthy-AI glossary; sector-specific readings not yet documented — contributions welcome.
The most widely used measure of dispersion of a frequency distribution introduced by K. Pearson (1893). It is equal to the positive square root of the variance. The standard deviation should not be confused with the root mean square deviation.
NIST AIRC, The Language of Trustworthy AI glossary (public-domain compilation), entry 'standard deviation', definition attributed to OECD