. 2006 Jun 8;114(9):1374–1380. doi: 10.1289/ehp.9169

Table 3.

Comparison of estimated PM₁₀ (μg/m³) at 94,135 geocoded addresses of WHI CT participant residences and examination sites using default and manually modified semivariograms.

	Summary statistics of cross-validations						Summary statistics of estimation
	PE		RMSS		SPE		Mean PM₁₀		Mean SE		PM₁₀ difference (default – modified)
Date	Default	Modified	Default	Modified	Default	Modified	Default	Modified	Default	Modified	Mean	SD
02/16/2000	0.0122	−0.0099	5.034	1.037	0.0470	0.0021	31.19	28.76	9.73	14.02	2.43	3.61
03/05/2000	0.1660	0.0474	5.134	1.360	0.0469	0.0058	20.85	20.10	10.99	13.80	0.75	4.24
07/15/2000	0.5278	0.0193	5.564	1.180	0.0674	−0.0024	24.01	23.83	7.57	10.13	0.18	3.11
08/07/2000	0.5524	−0.1056	6.183	1.134	0.1417	−0.0053	34.84	33.79	14.09	17.27	1.06	2.70
08/19/2000	0.7609	0.3651	4.744	1.146	0.0963	0.0142	25.07	24.76	13.59	13.54	0.30	3.64
10/28/2000	0.4590	0.0363	4.243	1.276	0.0780	0.0018	25.17	24.23	5.57	7.40	0.93	2.16