Journal of Chemical Engineering and Materials Science
Subscribe to JCEMS
Full Name*
Email Address*

Article Number - 466796E1469


Vol.2(1), pp. 12 - 20 , January 2011

ISSN: 2141-6605



Full Length Research Paper

Modified exponentially weighted moving average (EWMA) control chart for an analytical process data


 

Alpaben K. Patel1* and Jyoti Divecha2

 

 




 

1Directorate of Economics and Statistics, Sector-18, Gandhinagar-382009, India.

2Department of Statistics, Sardar Patel University, Vallabh Vidyanagar, 388120, India.


Email: alpakip@yahoo.co.in






 Accepted: 26 December 2010  Published: 31 January 2011

Copyright © 2011 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


 

This article introduces modified exponentially weighted moving average (modified EWMA) control chart. The modified EWMA control chart is very effective in detecting small and abrupt shifts in monitoring process mean. This chart is based on modified EWMA control chart statistic, which is a correction of EWMA chart statistic and it is free from inertia problem. The advantage of using modified EWMA chart is its good performance for observations that are autocorrelated or independently normal distributed. The performances of Modified EWMA chart are illustrated along with EWMA chart for the two types of analytical process data. The average run length (ARL) properties of modified EWMA scheme are derived using Markov Chain approach.

 

Key words: Abrupt change, autocorrelated, average run length, exponentially weighted moving average (EWMA), modified.


APA (2011). Modified exponentially weighted moving average (EWMA) control chart for an analytical process data. Journal of Chemical Engineering and Materials Science, 2(1), 12 - 20.
Chicago   Alpaben K. Patel and Jyoti Divecha    . "Modified exponentially weighted moving average (EWMA) control chart for an analytical process data." Journal of Chemical Engineering and Materials Science 2, no. 1 (2011): 12 - 20.
MLA   Alpaben K. Patel and Jyoti Divecha    . "Modified exponentially weighted moving average (EWMA) control chart for an analytical process data." Journal of Chemical Engineering and Materials Science 2.1 (2011): 12 - 20.
   
DOI
URL http://academicjournals.org/journal/JCEMS/article-abstract/466796E1469

Subscription Form