SPC without Control Limits and Normality Assumption: A New Method

  • J. A. Vazquez-Lopez
  • I. Lopez-Juarez
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5856)


Control Charts (CC) are important Statistic Process Control (SPC) tools developed in the 20’s to control and improve the quality of industrial production. The use of CC requires visual inspection and human judgement to diagnoses the process quality properly. CC assume normal distribution in the observed variables to establish the control limits. However, this is a requirement difficult to meet in practice since skewness distributions are commonly observed. In this research, a novel method that neither requires control limits nor data normality is presented. The core of the method is based on the FuzzyARTMAP (FAM) Artificial Neural Network (ANN) that learns special and non-special patterns of variation and whose internal parameters are determined through experimental design to increase its efficiency. The proposed method was implemented successfully in a manufacturing process determining the statistical control state that validate our method.


Control Charts Neural Networks Pattern Recognition 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • J. A. Vazquez-Lopez
    • 1
  • I. Lopez-Juarez
    • 1
  1. 1.Instituto Tecnologico de CelayaCentro de Investigacion y de Estudios Avanzados del IPN - Unidad Saltillo 

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