Table A1.
A stepwise comparison of variance inflation factors (VIFs) for variables that may influence dog populations in Tanzania. Predictor variables with highest VIF values were removed, and the stepwise comparison repeated until all VIF values were below 5. NA = not applicable after the predictor was dropped.
| Variables | VIF After Step | |||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Human population in 2014 | 972.8 | 9.5 | 2.4 | 2.9 |
| Number of households | 9.5 | NA | NA | NA |
| Proportion of livestock keeping households | 8.8 | 7.8 | 5.4 | NA |
| Number of people living in rural areas | 948.9 | 2.9 | NA | NA |
| Proportion of persons employed as livestock keepers | 1.6 | 1.6 | 1.4 | 1.3 |
| Setting (inland vs coastal) | 1.9 | 1.9 | 1.8 | 1.5 |
| Setting (mainland vs island) | 9.2 | 5.3 | 4.7 | 2.1 |
| Proportion of persons employed as peasant | 9.4 | 8.8 | 5.4 | 4.7 |
| Area | 8.2 | 4.3 | 4.1 | 3.1 |