caa a22 4500 378910272 CHVBK 20180305123540.0 cr unu---uuuuu 161128e200404 xx s 000 0 eng 10.1515/EQC.2004.29 doi (NATIONALLICENCE)gruyter-10.1515/EQC.2004.29 A Group Runs Control Chart for Detecting Shifts in the Process Mean [Elektronische Daten] [M. P. Gadre, R. N. Rattihalli] Wu and Spedding [Journal of Quality Technology 32: 32-38, 2000] have proposed the synthetic control chart to detect small shifts in process mean. In this paper, for the same problem, we propose a control chart called 'Group Runs' (GR) control chart, which is a combination of Shewhart's chart and an extended version of conforming run length chart. It is numerically verified that, the GR chart gives a significant reduction in out of control ATS as compared to those of the synthetic control chart and chart when in-control ATS is not smaller than a certain number. Steady state performance of the GR chart is also better. Hence, GR chart turns out to be economical to detect small shifts in the process mean. © Heldermann Verlag -Chart nationallicence CRL Chart nationallicence Synthetic Chart nationallicence Average Time to Signal (ATS) nationallicence Steady State ATS nationallicence Gadre M. P. Department of Statistics, Mudhoji College, Phaltan, Pin - 415523, INDIA. mpg28@rediffmail.com aut Rattihalli R. N. Department of Statistics, Shivaji University, Kolhapur, Pin-416004, INDIA. rnr5@rediffmail.com aut Economic Quality Control Walter de Gruyter GmbH & Co. KG 19/1(2004-04), 29-43 0940-5151 19:1<29 2004 19 EQC https://doi.org/10.1515/EQC.2004.29 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/EQC.2004.29 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gadre M. P. Department of Statistics, Mudhoji College, Phaltan, Pin - 415523, INDIA. mpg28@rediffmail.com aut NATIONALLICENCE 700 1- Rattihalli R. N. Department of Statistics, Shivaji University, Kolhapur, Pin-416004, INDIA. rnr5@rediffmail.com aut NATIONALLICENCE 773 0- Economic Quality Control Walter de Gruyter GmbH & Co. KG 19/1(2004-04), 29-43 0940-5151 19:1<29 2004 19 EQC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter