An introduction to proficiency testing, external quality assurance, and peer testing programs. Measures like SDI, CVI, and Total Error are defined and discussed.
Basic QC Practices
Answers for the QC Calculations Problem Set.
A problem set of sample data for users to calculate mean, SD, etc.
Answers to the Levey-Jennings Control Chart lesson exercise.
Those "Westgard rules" can be confusing. How do you use them? This lesson combines basic QC theory and practice to show you how. Dr. Westgard walks you through a Levey-Jennings chart day by day, plotting the control data and pointing out which run violates which rule. See how the multirule QC should be done (and find out if you've been doing it right yourself).