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Journal of Korean Society for Quality Management 1994;22(1): 66-. |
| Multivariate Control Charts for Means and Variances with Variable Sampling Intervals |
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| ABSTRACT |
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Several sample statistics to simultaneously monitor both means and variances for multivariate quality characteristics under multivariate normal process are proposed. Performances of multivariate Shewhart schemes and cumulative sum(CUSUM) schemes are evaluated for matched fixed sampling interval(FSI) and variable sampling interval(VSI) feature. Numerical results show that multivariate CUSUM charts are more efficient than Shewhart charts for small or moderate shifts and VSI feature is more efficient than FSI feature. |
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