Given 
an unbiased estimator of 
so that 
. Then
![var(T)>=1/(Nint_(-infty)^infty[(partial(lnf))/(partialtheta)]^2fdx),](/images/equations/FishersEstimatorInequality/NumberedEquation1.svg) |
where 
is the variance.
Fisher's Estimator Inequality
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Cite this as:
Weisstein, Eric W. "Fisher's Estimator Inequality." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/FishersEstimatorInequality.html