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Related Experiment Videos

Internal analytical quality control using the cusum chart and truncated V-mask procedure

R W Edwards

    Annals of Clinical Biochemistry
    |July 1, 1980
    PubMed
    Summary

    This study introduces a simple method for quality control using cumulative sum (cusum) charts and a V-mask. It enables operators without statistical training to monitor processes effectively.

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    Area of Science:

    • Quality Control
    • Statistical Process Monitoring

    Background:

    • Effective quality control is crucial for maintaining process stability.
    • Traditional statistical methods can be complex for operators.

    Purpose of the Study:

    • To present a simplified procedure for quality control using cusum charts.
    • To enable operators without statistical expertise to perform process monitoring.

    Main Methods:

    • Recording quality control data on a standard form.
    • Calculating cumulative sum (cusum) increments and sums.
    • Utilizing a truncated V-mask for control judgements.

    Main Results:

    • Facilitation of cusum chart plotting and interpretation.
    • Clear criteria for 'in control' and 'out of control' status.
    • Procedure is designed for operators without statistical training.

    Conclusions:

    • The cusum and truncated V-mask procedure offers a practical approach to quality control.
    • Statistical process monitoring can be effectively implemented by non-specialists.
    • Standardized data recording enhances the usability of cusum charts.

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