Dataset: westnilesc.dat Source: R.S. Roberts and I.M. Foppa (2006). "Prediction of Equine Risk of West Nile Virus Infection Based on Dead Bird Surveillance," Vector-Bourne and Zoonotic Diseases, Vol. 6, #1, pp. 1-6 Description: County level data for South Carolina on numbers of cases west nile virus in birds and equines, numbers of farms, area, and population. Key variables: Positive Bird Rate = # Bird Cases of West Nile / Human Population Positive Equine Rate = # of Equine Cases of West Nile / # Farms Poisson Regression Model: # Equine Cases = PBR + Human Density + PBR*HD w/ log(farms) as offset Variables/Columns county 1-24 bird cases 25-27 equine cases 34-35 farms 40-43 area 47-51 population 53-59 human density 61-67 positive bird rate 71-79 Positive Equine Rate 83-91