COMPARISON OF PROCESS CAPABILITY INDICES UNDER AUTOCORRELATED DATA

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 a...

Full description

Saved in:
Bibliographic Details
Published in:Revista Colombiana de estadística 2007-12, Vol.30 (2), p.301
Main Authors: Guevara, Rubén Darío, Vargas, José Alberto
Format: Article
Language:eng ; por
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0120-1751
2389-8976