Chapman-Robbins bound

== English == === Etymology === Named after Douglas Chapman and Herbert Robbins, who discovered it in 1951, independently of the original (1950) discovery by John Hammersley. === Noun === Chapman-Robbins bound (plural Chapman-Robbins bounds) (statistics) A lower bound on the variance of estimators of a deterministic parameter; a generalization of the Cramér-Rao bound, it is both tighter and more widely applicable, but usually harder to compute. Synonym: Hammersley-Chapman-Robbins bound