Laboratory Studies Part 4 - Ranking Test

Collaborative Laboratory Studies Part 4 - Ranking Test 

RANKING TEST FOR LABORATORIES AND METHODS (MANUAL COMPUTATIONS) 

Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Score  

The score values are compared to a statistical table of values found in reference [1]. This table is partially reproduced as Table 37-lc. If an individual laboratory score is equal to or outside of the limit boundaries, then we conclude that there is a pronounced systematic error present between the laboratory, or laboratories, with the extreme score. In this particular case the limits are 8 to 22, therefore there is no significant systematic error in the methods as determined using this test. 

Youden, W.J. and Steiner, E.H., Statistical Manual oftheAOAC, 1st ed. (Association of Official Analytical Chemists, Washington, DC, 1975). 

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