How are the results analysed?
For testing programs the evaluation of a laboratory’s performance is normally based on a comparison to consensus values calculated from the results submitted. Proficiency Testing Australia uses a suite of statistical procedures typically based on the internationally accepted method of calculating z-scores. Variation of results both within a laboratory and between laboratories may also be assessed.
For calibration programs, laboratory’s results are compared to the values established by a reference laboratory, taking into account the measurement uncertainties assigned to the reference value and those assigned by each participating laboratory. Performance of each measurement is judged by the calculation of the En ratio.
Proficiency Testing Australia provides both a final report and a summary sheet at the completion of the program. The final report contains the results reported by the participants, outcomes of the statistical analyses, graphical presentations of the data and comments on overall performance.
Guide to Proficiency Testing Australia 2008 (187.7 KB | 16.12.08)
