High Quality Content by WIKIPEDIA articles! In estimation theory and statistics, the Cramer–Rao bound (CRB) or Cramer–Rao lower bound (CRLB, named in honor of Harald Cramer and Calyampudi Radhakrishna Rao who were among the first to derive it, expresses a lower bound on the variance of estimators of a deterministic parameter. The bound is also known as the Cramer–Rao inequality or the information inequality.

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