Combined Application of Shewhart and Cumulative Sum <i>R</i> Chart for Monitoring Process Dispersion
Combined Application of Shewhart and Cumulative Sum <i>R</i> Chart for Monitoring Process Dispersion
This study analyzes the performance of combined applications of the Shewhart and cumulative sum (CUSUM) range R chart and proposes modifications based on well-structured sampling techniques, the extreme variations of ranked set sampling, for efficient monitoring of changes in the process dispersion. In this combined scheme, the Shewhart feature enables …