Table 6a:
Comparisona of candidate modelsb by Aikaike Information Criteria (AIC) model selection to predict the age class and presence of offspring for 83 female brown bears. Females < 3 years old were classified as immature (N = 25) whereas females ≥3 years old, which included solitary females (N = 33) and all females with offspring (N = 25), were classified as adult. Model F1 is an intercept-only (null) model
| Model | Hormone | Time | Study area | Contact method | Interactions | K | AICC | ∆AICC | wi | Accuracy (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| F6 | test, test2, cort, cort3 | sa | (test × sa), (test × cort3) | 7 | 80.10 | 0.00 | 0.91 | 77.1 | ||
| F4 | test, test2, prog3, cort, cort3 | y | (test × prog3), (cort × y) | 9 | 86.99 | 6.89 | 0.03 | 80.7 | ||
| F3 | test, test2, prog3, est, cort, cort3 | (test × prog3) | 8 | 87.06 | 6.95 | 0.03 | 78.3 | |||
| F2 | test2, prog, prog3, est, cort, cort3 | 7 | 87.51 | 7.41 | 0.02 | 77.1 | ||||
| F5 | test, test2, prog3, est, cort, cort3 | cm | (test × prog3), (est × cm) | 10 | 88.28 | 8.18 | 0.02 | 77.1 | ||
| F1 | 1 | 103.62 | 23.52 | 0.00 | 50.0 |
aStatistics are number of estimable parameters in model (K), sample-size-adjusted Akaike information criterion (AICC), difference in AICC between top model and model i (∆AICC), Akaike weight for model i (wi), and accuracy (%).
bVariables are testosterone (test), progesterone (prog), estradiol (est), cortisol (cort), year (y), study area (sa) and contact method (cm).