Statistical Process Control Applications for Monitoring of Volume Changes of Saltwater Fishery in Satun Province

Chaowarit Phanthong, Rungsarit Intaramo

Abstract

This study was intended to investigate changes in the amount of saltwater fishery in Satun Province. From Cumulative sum control chart (2004-2016), it found that saltwater fish species is the most abundant in Satun, whereas cephalopod-crustacean, and other species were caught in the similar quantity. In addition, CUSUM indicates the abnormality occurred rapidly with less than one side of the cumulative sum  which has decreased since 2013. This sent a clear warning that the process started out of control in 2014. Therefore, CUSUM control chart can verify that the saltwater fishery in Satun province has decreased rapidly since 2013.