Stub entry: single definition derived from the NIST trustworthy-AI glossary; sector-specific readings not yet documented — contributions welcome.
The difference between the observed value of an index and its “true” value. Errors maybe random or systematic. Random errors are generally referred to as “errors”. Systematic errors are called “biases”.
NIST AIRC, The Language of Trustworthy AI glossary (public-domain compilation), entry 'error', definition attributed to OECD