{"81141":{"#nid":"81141","#data":{"type":"event","title":"Statistics Seminar - Control Charts for Coefficient of Variation","body":[{"value":"\u003Cp\u003ETITLE: Control Charts for Coefficient of Variation\n\u003C\/p\u003E\u003Cp\u003ESPEAKER: Dr. Chang W. Kang\u003C\/p\u003E\u003Cp\u003EABSTRACT:\u003C\/p\u003E\u003Cp\u003EIn some manufacturing processes, the variance can change, depending on\nthe process mean. For example, if the output value reflects process\nyield, an increased mean might naturally lead to an increase in variance.\nWhen the variance is a function of the mean, the coefficient of variation\n(CV) is an appropriate measure for process variability. Since the CV\ncontrol chart was first introduced by Kang et al (2007), there were some\ntrials to improve the performance of CV control charts depending on the\nshift size.\n\u003C\/p\u003E\u003Cp\u003E\nIn this research, we present some CV related control charts and compare\nthe performance of those control charts for better use in the field.\nThe CV control chart shows good sensitivity to large shift in CV.\nThe CV-EWMA control chart(2008), the CV-DEWMA control chart(2011)\nand the CV-GWMA control chart(2011) were developed to control\nprocesses sensitively responding to small shifts of CV.\nThe FIR CV-GWMA control chart is more effective control chart\nto detecting off-target processes in the stage of set-up or start-up of\nprocess.\n\u003C\/p\u003E\u003Cp\u003E\nHost:  Professor Paul Kvam \u003Ca href=\u0022mailto:paul.kvam@isye.gatech.edu\u0022\u003E\u0026lt;paul.kvam@isye.gatech.edu\u0026gt;\u003C\/a\u003E\n\n\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Control Charts for Coefficient of Variation"}],"uid":"27187","created_gmt":"2012-01-23 10:50:49","changed_gmt":"2016-10-08 01:57:11","author":"Anita Race","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2012-01-26T10:00:00-05:00","event_time_end":"2012-01-26T11:00:00-05:00","event_time_end_last":"2012-01-26T11:00:00-05:00","gmt_time_start":"2012-01-26 15:00:00","gmt_time_end":"2012-01-26 16:00:00","gmt_time_end_last":"2012-01-26 16:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1242","name":"School of Industrial and Systems Engineering (ISYE)"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EDr. Paul Kvam\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E \u003Ca href=\u0022mailto:paul.kvam@isye.gatech.edu\u0022\u003Epaul.kvam@isye.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}