Linked from

The 4 pages that link to Rao–Blackwell theorem, each with the reason it gives.

• Conditional expectationRelated: It turns conditional expectation into a method for improving statistical estimators.

• Sufficient statisticRelated: It turns a sufficient statistic into a tool for improving unbiased estimators.

• Lehmann–Scheffé theoremRelated: Conditioning supplies the variance-reduction step used alongside completeness.