Table 2. Estimates of coefficients, standard errors, and significance based on z tests for optimal generalized linear model for whether animals were seropositive for antibody to Yersinia pestis*.
| Comparator | Effect | Estimate | Standard error | z value | p(>|z|) value† |
|---|---|---|---|---|---|
| Intercept | –1.00 | 0.19 | –5.19 | 2.07 × 10–7 | |
| Adult | Subadult | –0.73 | 0.31 | –2.37 | 0.018 |
| Adult | Juvenile | –1.94 | 0.61 | –3.19 | 0.0015 |
| Year 1 | Year 2 | 0.15 | 0.27 | 0.55 | 0.58 |
| Year 1 | Year 3 | 0.534 | 0.53 | 1.00 | 0.32 |
| NBT | 2.54 | 0.88 | 2.88 | 0.0040 | |
| Site 1 | Site 2 | –0.36 | 0.26 | –1.39 | 0.16 |
| Not recaptured? | Recaptured | –0.35 | 0.17 | –2.08 | 0.037 |
| Adult × year 1 | Subadult × year 2 | –1.76 | 0.50 | –3.49 | 0.00049 |
| Adult × year 1 | Juvenile × year 2 | –0.11 | 0.66 | –0.16 | 0.87 |
| Adult × year 1 | Subadult × year 3 | –2.91 | 1.09 | –2.68 | 0.0073 |
| Adult × year 1 | Juvenile × year 3 | –11.90 | 401.1 | –0.03 | 0.98 |
| Adult × NBT | Subadult × NBT | 7.79 | 2.25 | 3.47 | 0.00053 |
| Adult × NBT | Juvenile × NBT | 9.47 | 3.89 | 2.43 | 0.015 |
| Year1 × NBT | Year 2 × NBT | –3.60 | 1.49 | –2.41 | 0.016 |
| Year1 × NBT | Year 3 × NBT | –7.59 | 3.07 | –2.47 | 0.013 |
| Site1 × year1 | Site 2 × year 2 | 0.26 | 0.33 | 0.80 | 0.42 |
| Site1 × year1 | Site 2 × year 3 | –2.97 | 1.14 | –2.60 | 0.0094 |
| Site1 × NBT | Site 2 × NBT | 6.42 | 1.68 | 3.81 | 0.00014 |
*NBT, nitroblue-tetrazolium. †Probability of exceeding the z value by chance alone.