Amin , Ayman  A. Hassan ,   Emad  EHamdy,   Hosny  I. 2020-12-282020-12-2812/15/202010.3390/sym12122084 http://repository.msa.edu.eg/xmlui/handle/123456789/4272https://www.scimagojr.com/journalsearch.php?q=21100201542&tip=sid&clean=0Overview Stats Comments Citations References (31) Related research (10+) Recommend this research to let the authors know you liked their work Not now Recommend Abstract In this paper we discuss the multistage sequential estimation of the variance of the Rayleigh distribution using the three-stage procedure that was presented by Hall (Ann. Stat. 9(6):1229–1238, 1981). Since the Rayleigh distribution variance is a linear function of the distribution scale parameter’s square, it suffices to estimate the Rayleigh distribution’s scale parameter’s square. We tackle two estimation problems: first, the minimum risk point estimation problem under a squared-error loss function plus linear sampling cost, and the second is a fixed-width confidence interval estimation, using a unified optimal stopping rule. Such an estimation cannot be performed using fixed-width classical procedures due to the non-existence of a fixed sample size that simultaneously achieves both estimation problems. We find all the asymptotic results that enhanced finding the three-stage regret as well as the three-stage fixed-width confidence interval for the desired parameter. The procedure attains asymptotic second-order efficiency and asymptotic consistency. A series of Monte Carlo simulations were conducted to study the procedure’s performance as the optimal sample size increases. We found that the simulation results agree with the asymptotic results.en-USOctober University for three‐stage  procedure optimal stopping  ruleMonte  Carlo  simulationloss  functionasymptotic  regretcoverage  probabilityArticle