Estimator
Sampling deviation

For a given sample x {\displaystyle x}, the sampling deviation of the estimator θ ^ {\displaystyle {\widehat {\theta }}} is defined as

where E (θ ^ (X)) {\displaystyle \operatorname {E} ({\widehat {\theta }}(X))} is the expected value of the estimator. The sampling deviation, d, depends not only on the estimator, but also on the sample.
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