Consistent estimator

T1, T2, T3, … is a sequence of estimators for parameter θ0, the true value of which is 4. This sequence is consistent: the estimators are getting more and more concentrated near the true value θ0; at the same time, these estimators are biased. The limiting distribution of the sequence is a degenerate random variable which equals θ0 with probability 1.

In statistics, a consistent estimator or asymptotically consistent estimator is an estimator—a rule for computing estimates of a parameter θ₀—having the property that as the number of data points used increases indefinitely, the resulting sequence of estimates converges in probability to θ₀. This means that the distributions of the estimates become more and more concentrated near the true value of the parameter being estimated, so that the probability of the estimator being arbitrarily close to θ₀ converges to one.

单词	Inconsistent estimator
释义	Inconsistent estimator 英语百科 Consistent estimator In statistics, a consistent estimator or asymptotically consistent estimator is an estimator—a rule for computing estimates of a parameter θ₀—having the property that as the number of data points used increases indefinitely, the resulting sequence of estimates converges in probability to θ₀. This means that the distributions of the estimates become more and more concentrated near the true value of the parameter being estimated, so that the probability of the estimator being arbitrarily close to θ₀ converges to one.
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Inconsistent estimator

Consistent estimator