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Consistent Estimator

Consistent Estimator:

An estimator is a measure or metric intended to be calculated from a sample drawn from a larger population. A consistent estimator is an estimator with the property that the probability of the estimated value and the true value of the population parameter not lying within c units (c is any arbitrary positive constant) of each other approaches zero as the sample size tends to infinity. For example, consider a population mean of 10 and an interval of 1 unit either side -- the interval from 9 to 11. As samples get larger, the probability that the sample mean will fall outside that interval diminishes, and approaches zero when the sample gets large enough. For a smaller interval, it takes longer for the probability to approach zero.

 

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