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A Nonparametric EWMA Sign Chart for Location Based on Individual Measurements

Summary: Nonparametric control charts are useful when there is limited or complete lack of knowledge about the form of the underlying distribution. Though traditional statistical process control (SPC) applications of control charts involve subgrouped data, recent advances have led to more and more instances where individual measurements (data) are collected over time. A two-sided nonparametric exponentially weighted moving average (EWMA) control chart for i.i.d. individual data is proposed based on the sign (SN) statistic.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: contaminated normal, distribution-free, individual measurements, Markov chain, median, outlier, quality control, robust, simulation
  • Author: Graham, M. A.; Chakraborti, S.; Human, S. W.
  • Journal: Quality Engineering