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Table 3 Semi-variogram estimates of the sill and range for the bird and human data from 2002 to 2005 as well as the average of the four years.

From: Investigating the spatial risk distribution of West Nile virus disease in birds and humans in southern Ontario from 2002 to 2005

  Sill Range
Bird 2002 82.29 81368.91
Bird 2003 82.34 132874.38
Bird 2004 56.34 245213.13
Bird 2005 355.07 335208.03
Bird Total 71.60 180000.00
Human 2002 3.03 184517.40
Human 2003 0.11 158159.40
Human 2004 0.001 101754.00
Human 2005 3.41 1270482.00
Human Total 1.04 112422.00