Statistical Papers

, Volume 52, Issue 4, pp 799–811 | Cite as

A unification and some corrections to Markov chain approaches to develop variable ratio sampling scheme control charts

  • Alireza Faraz
  • Erwin SanigaEmail author
Regular Article


We provide some unifying definitions, make some corrections to articles by Faraz and Parsian (J Stat Pap 47:569–593, 2006) and Costa (J Qual Technol 26:155–163, 1994; 29:197–204, 1997), and using these provide more accurate tables of results and comparisons of control charts. We also investigate the impact of an incorrectly specified process shift on signal frequency.


Quality control charts Variable sample size (VSS) Variable sampling intervals (VSI) Variable sample size and sampling intervals (VSSVSI) Markov chain Adjusted average time to signal (AATS) 


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Industrial Engineering Department, School of EngineeringTarbiat Modares UniversityTehranIran
  2. 2.Department of Business AdministrationUniversity of DelawareNewarkUSA

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