Spatio-temporal analysis of the relationship between WNV dissemination and environmental variables in Indianapolis, USA

Table 1 Environmental factors remained after Discriminant Analysis.

Year	Variable	Classification function coefficient	Eigenvalue	BG with WNV/BG without WNV	Grouping accuracy
2002	Percentage of agriculture	0.143	0.226	46/612	86.90%
	Total length of streams	0.001
	Total size of wetlands	0.001
	Constant	-2.124
2003	Percentage of agriculture	0.126	0.202	35/623	84.80%
	Total length of streams	0.001
	Constant	-1.336
2004	Percentage of agriculture	0.154	0.201	25/633	84.80%
	Percentage of water	0.037
	Mean slope	1.908
	DEM variation	0.049
	Constant	-4.261
2005	Percentage of agriculture	0.232	0.24	36/622	90.30%
	Total size of wetlands	0.001
	Constant	-2.499
2006	Total size of wetlands	0.001	0.157	29/629	85.30%
	Human population density	0.001
	Constant	-2.141
2007	Percentage of agriculture	0.051	0.195	16/642	88.90%
	Total length of streams	0.001
	Percentage of water	0.205
	Distance to the closest pollutant	0.001
	Distance to the closest waste industry	0.003
	Constant	-4.709

Their coefficients, eigenvalue, the numbers of census blockgroups with mosquito WNV cases and without WNV cases, and grouping accuracies.

ISSN: 1476-072X