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題名 A simple approach for monitoring business service time variation
作者 Yang,Su-Fen;Barry C.Arnold
貢獻者 統計系
日期 2014.05
上傳時間 11-Nov-2014 11:02:32 (UTC+8)
摘要 Control charts are effective tools for signal detection in both manufacturing processes and service processes. Much of the data in service industries comes from processes having nonnormal or unknown distributions. The commonly used Shewhart variable control charts, which depend heavily on the normality assumption, are not appropriately used here. In this paper, we propose a new asymmetric EWMA variance chart (EWMA-AV chart) and an asymmetric EWMA mean chart (EWMA-AM chart) based on two simple statistics to monitor process variance and mean shifts simultaneously. Further, we explore the sampling properties of the new monitoring statistics and calculate the average run lengths when using both the EWMA-AV chart and the EWMA-AM chart. The performance of the EWMA-AV and EWMA-AM charts and that of some existing variance and mean charts are compared. A numerical example involving nonnormal service times from the service system of a bank branch in Taiwan is used to illustrate the applications of the EWMA-AV and EWMA-AM charts and to compare them with the existing variance (or standard deviation) and mean charts. The proposed EWMA-AV chart and EWMA-AM charts show superior detection performance compared to the existing variance and mean charts. The EWMA-AV chart and EWMA-AM chart are thus recommended.
關聯 The Scientific World Journal,Volume 2014 (2014), Article ID 238719
資料類型 article
DOI http://dx.doi.org/10.1155/2014/238719
dc.contributor 統計系en_US
dc.creator (作者) Yang,Su-Fen;Barry C.Arnolden_US
dc.date (日期) 2014.05en_US
dc.date.accessioned 11-Nov-2014 11:02:32 (UTC+8)-
dc.date.available 11-Nov-2014 11:02:32 (UTC+8)-
dc.date.issued (上傳時間) 11-Nov-2014 11:02:32 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/71321-
dc.description.abstract (摘要) Control charts are effective tools for signal detection in both manufacturing processes and service processes. Much of the data in service industries comes from processes having nonnormal or unknown distributions. The commonly used Shewhart variable control charts, which depend heavily on the normality assumption, are not appropriately used here. In this paper, we propose a new asymmetric EWMA variance chart (EWMA-AV chart) and an asymmetric EWMA mean chart (EWMA-AM chart) based on two simple statistics to monitor process variance and mean shifts simultaneously. Further, we explore the sampling properties of the new monitoring statistics and calculate the average run lengths when using both the EWMA-AV chart and the EWMA-AM chart. The performance of the EWMA-AV and EWMA-AM charts and that of some existing variance and mean charts are compared. A numerical example involving nonnormal service times from the service system of a bank branch in Taiwan is used to illustrate the applications of the EWMA-AV and EWMA-AM charts and to compare them with the existing variance (or standard deviation) and mean charts. The proposed EWMA-AV chart and EWMA-AM charts show superior detection performance compared to the existing variance and mean charts. The EWMA-AV chart and EWMA-AM chart are thus recommended.en_US
dc.format.extent 3022933 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) The Scientific World Journal,Volume 2014 (2014), Article ID 238719en_US
dc.title (題名) A simple approach for monitoring business service time variationen_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1155/2014/238719en_US
dc.doi.uri (DOI) http://dx.doi.org/10.1155/2014/238719en_US