Journal of Process Control, Vol.22, No.2, 397-403, 2012
Nonparametric profile monitoring in multi-dimensional data spaces
Profile monitoring has received increasingly attention in a wide range of applications in statistical process control (SPC). In this work, we propose a framework for monitoring nonparametric profiles in multi-dimensional data spaces. The framework has the following important features: (i) a flexible and computationally efficient smoothing technique, called Support Vector Regression, is employed to describe the relationship between the response variable and the explanatory variables; (ii) the usual structural assumptions on the residuals are not required; and (iii) the dependence structure for the within-profile observations is appropriately accommodated. Finally, real AIDS data collected from hospitals in Taiwan are used to illustrate and evaluate our proposed framework. (C) 2011 Elsevier Ltd. All rights reserved.
Keywords:Nonparametric profile monitoring;Support Vector Regression;Block bootstrap;Confidence region