The statistical evaluation of the interlaboratory comparison is defined in ISO 13528 and ISO 5725-2.
148 testing laboratories from 35 countries all over the world participated in 66 individual test methods in the last proficiency test OFI-pts2020.
Argentina | Malaysia |
Austria | Marocco |
Belgium | Norway |
Bulgaria | Poland |
Canada | Portugal |
China | Romania |
Croatia | Slovakia |
Czech Republic | Slovenia |
Finland | South Korea |
France | Sri Lanka |
Germany | Spain |
Great Britain | Sweden |
Greece | Switzerland |
Hungary | The Netherlands |
Israel | Turkey |
Italy | Thailand |
Japan | USA |
Lativia |
Evaluation parameter
Outlier according to Grubbs’ test
Outlier according to Cochran’s test
z-score
Youden-Plot (Scatter diagram)