Systematic vs Random Effects

Systematic vs Random Effects

1. There are two widely used methods to quantify the uncertainty of a measurement

   • Calibration laboratories
   • scientific institutions

2. The GUM method involves first considering all of the influences which might affect the measurement result

3. ‘Law of Propagation of Uncertainty

4. reference calibrated 25 or more times and then consider variation and bias in results

5. repeatability study outside of MSA

6. statistical technique called ANOVA is then used to determine how much variation

7. the measurement process is maintained as a black box

8. Two important concepts in MSA

   • precision