Comparison of Process Capability Indices under Autocorrelated Data

Rubén Darío Guevara · José Alberto Vargas

15 citations0/0 files storedRevista Colombiana de Estadística

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Advanced Statistical Process Monitoring Management and Optimization Techniques Fault Detection and Control Systems

Abstract

The process capability indices provide a measure of how a process fits within the specification limits. In calculating indices is usual to assume that the process data are independent. However, in industrial applications data are often autocorrelated. This paper deals with the indices Cp, Cpk, Cpm and Cpmk when data are autocorrelated. Variances for their estimators are derived and coverage probabilities of some confidence intervals are calculated.

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References

2002Introduction to Time Series and Forecasting 1991The Taguchi Capability Index 2002Process Capability Indices—A Review, 1992–2000 1990How Reliable is Your Capability Index?2003A Bibliography of Process Capability Papers 1998Estimating process capability indexes for autocorrelated data 1997PROCESS CAPABILITY ANALYSIS WHEN DATA ARE AUTOCORRELATED

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2011Process capability analysis for serially dependent processes of Poisson counts

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