AU - Momeni, F. AU - Shokri, S. TI - Nonparametric Shewhart-type quality control charts in fuzzy environment PT - JOURNAL ARTICLE TA - IJAORLU JN - IJAORLU VO - 9 VI - 3 IP - 3 4099 - http://ijorlu.liau.ac.ir/article-1-581-en.html 4100 - http://ijorlu.liau.ac.ir/article-1-581-en.pdf SO - IJAORLU 3 ABĀ  - 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. CP - IRAN IN - LG - eng PB - IJAORLU PG - 28 PT - Research YR - 2019