Concept of Ranked Set Sampling is applicable whenever ranking on a set of sampling units can be done easily by a judgment method or based on an auxiliary variable. In this work, we consider a study variable correlated with auxiliary variable which is used to rank the sampling units. Further is assumed to have bivariate Lomax distribution. We obtain an unbiased estimator of scale parameter of study variable based on ranked set sample and censored ranked set sample. Efficiency comparison of these estimators with usual SRS estimator is also performed.
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