{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T13:02:33Z","timestamp":1770555753851,"version":"3.49.0"},"reference-count":23,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2018,12,7]],"date-time":"2018-12-07T00:00:00Z","timestamp":1544140800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>Conventional control charts are one of the most important techniques in statistical process control which are used to assess the performance of processes to see whether they are in- or out-of-control. As traditional control charts deal with crisp data, they are not suitable to study unclear, vague, and fuzzy data. In many real-world applications, however, the data to be used in a control charting method are not crisp since they are approximated due to environmental uncertainties and systematic ambiguities involved in the systems under investigation. In these situations, fuzzy numbers and linguistic variables are used to grab such uncertainties. That is why the use of a fuzzy control chart, in which fuzzy data are used, is justified. As an exponentially weighted moving average (EWMA) scheme is usually used to detect small shifts, in this paper a fuzzy EWMA (F-EWMA) control chart is proposed to detect small shifts in the process mean when fuzzy data are available. The application of the newly developed fuzzy control chart is illustrated using real-life data.<\/jats:p>","DOI":"10.3390\/info9120312","type":"journal-article","created":{"date-parts":[[2018,12,10]],"date-time":"2018-12-10T03:36:41Z","timestamp":1544413001000},"page":"312","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["A Fuzzy EWMA Attribute Control Chart to Monitor Process Mean"],"prefix":"10.3390","volume":"9","author":[{"given":"Muhammad Zahir","family":"Khan","sequence":"first","affiliation":[{"name":"Department of Mathematics and Statistics, Riphah International University, Islamabad 45210, Pakistan"}]},{"given":"Muhammad Farid","family":"Khan","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Statistics, Riphah International University, Islamabad 45210, Pakistan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0644-1950","authenticated-orcid":false,"given":"Muhammad","family":"Aslam","sequence":"additional","affiliation":[{"name":"Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah 21551, Saudi Arabia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6281-055X","authenticated-orcid":false,"given":"Seyed Taghi Akhavan","family":"Niaki","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering, Sharif University of Technology, P.O. Box 11155-9414 Azadi Ave., Tehran 15119-43943, Iran"}]},{"given":"Abdur Razzaque","family":"Mughal","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Statistics, Riphah International University, Islamabad 45210, Pakistan"}]}],"member":"1968","published-online":{"date-parts":[[2018,12,7]]},"reference":[{"key":"ref_1","unstructured":"Devor, R.E., Chang, T., and Sutherland, J.W. (2007). 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