Errata

Figures & data

TABLE I Accuracy After Bias Correction of XRF Pb Method for _n Data Points Between 10 μg and 300 μg in Comparison with ICP Method with Assumed RSD_ref = 5%

				Bootstrap		ISO GUM
Sampler	N	Bias	Outliers	Â	A 95	Â	A 95
				(%)	(%)	(%)	(%)
GSP	83	–0.077	0	23.1	27.4	20.5	25.1
CFC	70	–0.006	0	24.6	29.8	29.8	31.8
25-mm	57	–0.062	1	26.0	33.5	33.1	37.6
Button	68	–0.089	2	21.0	30.1	24.0	26.5
IOM	58	0.00	1	34.2	44.0	39.7	43.3
Note: The ISO GUM approach to estimated uncertainty, reduced by observed outliers, is presented together with comparable bootstrap estimates.