Table 5. Logistic regression models of variation in avian influenza virus (AIV) seroprevalence for northern pintails, sampled in Alaska, USA, 2009.
| Northern pintails (n = 606) | ||||
| Models | k a | AICb | ΔAIC | ωi b |
| Age + Sex | 2 | 342.95 | 0.00 | 0.71 |
| Site + Age+ Sex | 3 | 344.75 | 1.80 | 0.29 |
Models examine the effects of location (site), while controlling for sex and age (adult vs. subadult).
a
k = number of parameters in model.
b
The best approximating model has the lowest Akaike's Information Criterion (AIC) value and the highest model weight (ωi), relative to others in the model set.