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Abstract
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We obtain unbiased estimators for a parameter of Morgenstern type bivariate gamma
distribution (MTBGD) based on the observations made on the units of the ranked set sampling
regarding the study variable Y which is correlated with the auxiliary variable X, when (X; Y )
follows a MTBGD. Efficiency comparisons among these estimators are also made in this work.
Finally, we illustrate the methods developed by using a real data set in marine biological science.
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