Table 2.
Parameter estimates for the selected multivariate logistic regression model (model 3, Table 1) predicting areas of elevated risk for exposure to Yersinia pestis in the West Nile region of Uganda*
| Model covariates | Parameter estimate | Likelihood ratio test | |||
|---|---|---|---|---|---|
| Estimate | SE | χ2 | df | P | |
| Intercept | −5.00 | 2.31 | 5.18 | 1 | 0.02 |
| 1,300 meter elevation cut-off | 2.06 | 0.65 | 20.79 | 1 | < 0.0001 |
| Landsat ETM+ band 3 | 0.16 | 0.06 | 6.61 | 1 | 0.01 |
| Landsat ETM+ band 6 | −0.13 | 0.05 | 6.60 | 1 | 0.01 |
| Brightness | 0.01 | 0.03 | 0.14 | 1 | 0.71 |
*
df = degrees of freedom. ETM+ = Enhanced Thematic Mapper Plus. Whole model test χ2 = 25.53, df = 4, P < 0.0001; goodness of fit χ2 = 111.15, P = 0.15.