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Quality Quandaries: On the Application of Different Ranked Set Sampling Schemes

Summary: Sampling methods play a vital role in many disciplines, including medical sciences, engineering, education, and industrial processes. In order to obtain representative sampling units, we rely on the choice of an adequate sampling mechanism. A commonly used method of selection is simple random sampling (SRS). One may think of alternative sampling schemes when some extra information is available about the study variable. In such situations, we need an easy-to-measure and/or cheap covariate that helps selecting an appropriate sample before the actual measurements are taken. This column is intended for practitioners who want to become familiar with different ranked set strategies to collect sample data. The methods are illustrated by the example of an application to an industrial process. The column provides the procedures of different sampling strategies for collecting samples from an ongoing process. It also shows the application of ranked set–based process monitoring using a dispersion control chart.

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  • Topics: Sampling
  • Keywords: Sampling, Sampling plans, Random sampling, Dispersion, Control charts
  • Author: Mehmood, Rashid; Riaz, Muhammad; Does, Ronald J.M.M.;
  • Journal: Quality Engineering