Previous Proficiency Service

From 2014 to 2023, with the support of participating laboratories, Labthink organized 10 times of proficiency service.

In the past 10 times proficiency service, permeability results are based on analysis of Z-score statistics. The results of tensile and thickness properties were analyzed with Cochran method and Grubbs method, which are usually used in statistical analysis of outliers. Results from previous events are as follow:

Item		Year	Number of results	Straggler	Outlier
OTR		2014	104	6%	1%
		2015	79	4%	1%
		2016	90	6%	3%
		2017	81	9%	7%
		2018	88	3%	6%
		2019	94	2%	5%
		2020	73	1%	4%
		2021	86	3%	3%
		2022	105	3%	10%
		2023	111	3%	4%
WVTR		2014	110	7%	7%
		2015	87	3%	6%
		2016	100	11%	5%
		2017	91	8%	11%
		2018	94	4%	10%
		2019	102	1%	7%
		2020	92	5%	5%
		2021	89	3%	9%
		2022	112	3%	10%
		2023	113	1%	6%
Tensile property	Tensile Force at Break	2017	59	8%	8%
		2018	76	7%	4%
		2019	96	1%	9%
		2021	95	0%	9%
		2022	126	1%	2%
		2023	111	3%	8%
	Tensile Strain at Break	2019	96	2%	14%
		2021	90	1%	22%
		2022	123	2%	9%
		2023	111	3%	11%
	Tensile Strength	2017	59	2%	12%
	Tensile Strength	2018	76	1%	12%
Thickness		2019	93	0%	6%

Previous Proficiency Service

Previous Proficiency Service

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