| Article ID: | iaor20021326 |
| Country: | United States |
| Volume: | 31 |
| Issue: | 6 |
| Start Page Number: | 569 |
| End Page Number: | 579 |
| Publication Date: | Jun 1999 |
| Journal: | IIE Transactions |
| Authors: | Rao B.V., Acosta-Mejia C.A., Pignatiello J.J. |
We consider several control charts for monitoring normal processes for changes in dispersion. We present comparisons of the average run length performances of these charts. We demonstrate that a CUSUM chart based on the likelihood ratio test for the change point problem for normal variances has an ARL performance that is superior to other procedures. Graphs are given to aid in designing this control chart.