# Three-Stage Sequential Estimation Of The Inverse Coefficient Of Variation Of The Normal Distribution

COMPUTATION（2019）

Abstract

This paper sequentially estimates the inverse coefficient of variation of the normal distribution using Hall's three-stage procedure. We find theorems that facilitate finding a confidence interval for the inverse coefficient of variation that has pre-determined width and coverage probability. We also discuss the sensitivity of the constructed confidence interval to detect a possible shift in the inverse coefficient of variation. Finally, we find the asymptotic regret encountered in point estimation of the inverse coefficient of variation under the squared-error loss function with linear sampling cost. The asymptotic regret provides negative values, which indicate that the three-stage sampling does better than the optimal fixed sample size had the population inverse coefficient of variation been known.

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Key words

inverse coefficient of variation,normal distribution,regret,squared-error loss function,three-stage procedure

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