e/Chapman–Robbins bound

Information
has gloss	eng: In statistics, the Chapman–Robbins bound or Hammersley–Chapman–Robbins bound is a lower bound on the variance of estimators of a deterministic parameter. It is a generalization of the Cramér–Rao bound; compared to the Cramér–Rao bound, it is both tighter and applicable to a wider range of problems. However, it is usually more difficult to compute.
lexicalization	eng: Chapman-Robbins bound
lexicalization	eng: Chapman–Robbins bound
instance of	c/Statistical inequalities