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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A self-starting statistical control chart methodology for data exhibiting linear trend

McClurg, Brian Matthew 01 May 2016 (has links)
Traditional quality control charts are designed to monitor and control a quality characteristic for processes with a stable in-control state in which enough data is available to estimate the process parameters prior to a production run. For many processes we desire the ability to monitor a quality characteristic that has an in-control state not stable such as a degradation or deterioration process that exhibits a linear trend as its in-control state. In addition, there are many times when sufficient sampling for in-control parameter estimation is not possible before the production run due to cost or collection time. We therefore desire a self-starting charting scheme that monitors both in-control and out of control linear trends. We present here the needed results so that a process with the in-control linear trend can be charted to detect slope and intercept shifts, when accurate information on in-control parameters is not available. We propose a Q chart scheme, a EWMA Q chart, and a EWMA Q chart with delay parameter d that utilizes results from statistical process control and linear regression. The developed control chart schemes are tested through simulation studies and applied to real data examples.

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