Context Measuring the quality of habitats necessary for survival threatened species is a priority conservation management, but traditional metrics are often too costly to implement. As result, many practitioners rely on proxies such as habitat suitability, which measured by relating environmental variables occurrence data using suitability models. However, little research has examined how these...

This paper presents improved population mean estimators using auxiliary variables in Stratified Ranked Set Sampling. We have derived the expressions for bias and square errors up to first order of approximation shown that proposed under optimum conditions are more efficient than other taken this paper. In an attempt verify efficiencies estimators, theoretical results supported by numerical illu...