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    NEW! Risk Analysis Guidelines Analysis

    Get an overview of ISO standards 15189, 14971, and 22367 and CLSI guidelines EP18, EP22, and EP23. With Risk Management coming into medical laboratories, now is the time to learn these important Risk Analysis concepts recommended by these documents.

    Introduction to Risk Analysis

    New standards and guidelines for Quality are heading toward the lab, based on Risk Management principles. Learn all about them now.

    Quality Management and Design of Analytical Systems (An Introduction)

    Quality Planning and Design are part of a larger systems approach to analytical management. in this new six lesson course, participants will review current guidelines for quality and learn to use QC Design tools to customize their procedures and achieve the quality required by their tests.

    Basic QC Practices

    Our most popular course, covering the fundamentals of quality control in the laboratory.

    Basic Method Validation

    This course teaches all the experiments and calculations needed for a basic validation of a new instrument. Linearity, Reportable Range, Comparison of Methods, Correlation, Replication, Interference, Recovery, Detection Limit and Reference Range studies are explained and demonstrated. Educational online tools allow participants to enter data and view results immediately.

    Secrets of Method Validation Streaming Video course

    A short animated slide show, narrated by Dr. Westgard, explaining the Inner, Hidden, Deeper, Secret Meaning of Method Validation

    "Westgard Rules" and Levey-Jennings short course

    Everything you ever wanted to know - and were afraid to ask - is included in this online course. All the rules, combinations, and interpretations are included. Online graphing tools allow you to enter data and see the interpretation.

    Westgard QC, Inc. was the first company to offer accredited online courses through both the AACC and ASCLS. More than a thousand participants from over 30 countries have taken our online courses.

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February 23, 2012


Tomas Persson

Actually, there is yet another possible explanation to a SD of 0.
If you have a method that is very reliable, few significant figures in the result and furthermore as few results as 20 you can get 8.0 20 times as a result. The SD of this serie would be 0.
The solution to this problem would, of course, be the same as the solution to the one above. Use the cumulative data.


Would it not be appropriate,in the abscense of cum data, if the method could only be reported in whole numbers to use the limits of the next reportable value. As could be the case with cpk where no decimal place reporting occurs, setting the sd to 0.5 gives you a 2sd w on the next reportable value.

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