Meanings
nounCramér-Rao bound (plural Cramér-Rao bounds)
plural Cramér-Rao bounds
- estimation theorymathematicsA lower bound on the variance of unbiased estimators of a deterministic (fixed, though unknown) parameter.
Origin
Named after Harald Cramér and Calyampudi Radhakrishna Rao, who (among others) independently derived it in the 1940s.
Full word history & related roots →Cite this entry
APA
Cramér-Rao bound. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Cram%C3%A9r-Rao%20bound
MLA
“Cramér-Rao bound.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Cram%C3%A9r-Rao%20bound. Accessed November 5, 2026.
Chicago
WatkinsX Dictionary, s.v. “Cramér-Rao bound,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Cram%C3%A9r-Rao%20bound.
Source: Cramér-Rao bound on Wiktionary, CC BY-SA 4.0.