XBar control chart with VSS for iOS

This application computes the ARL (Average Run Length) of a Xbar control with variable sample size (VSS).In addition, it performs an optimization of the parameters (warning limit, control limits and the two sample sizes) in order to minimize the out-of-control ARL.It draws the ARL curves to compare the performance of the standard Xbar chart and the Xbar with VSS.There is a twin application for OS X available in its store.At the moment the supported languages are Spanish and English.