TY - JOUR T1 - Nonparametric Shewhart-type quality control charts in fuzzy environment TT - JF - IJAORLU JO - IJAORLU VL - 9 IS - 3 UR - http://ijorlu.liau.ac.ir/article-1-581-en.html Y1 - 2019 SP - 28 EP - 44 KW - Fuzzy Sign Control Chart KW - Synthetic Control Chart KW - Average Run Length KW - D_p KW - q-Distance KW - Credibility Measure N2 - Nonparametric control charts are presented in order to figure out the problem of detecting changes in the process median (or mean)‎, ‎or changes in the variability process where there is limited knowledge regarding the underlying process‎. ‎When observations are reported imprecise‎, ‎then it is impossible to use classical nonparametric control charts‎. ‎This paper is devoted to the problem of constructing nonparametric control charts in presence of fuzzy data and parameters‎. ‎For this aim‎, ‎we propose two different methods‎: ‎distance between fuzzy numbers and credibility measure for ranking fuzzy data‎, ‎that can be used to construct sign and Wilcoxon signed-rank control charts‎. ‎Then‎, ‎this statistical control charts are applied to monitor location and scale parameters of a continuous statistical process‎. ‎Finally‎, ‎proposed control charts application is evaluated with numerical examples. M3 ER -