Table 3. Log likelihood (LL), number of parameters (K), AIC, ΔAIC, and Akaike weight (w) for the top three models of the initial and final analyses of American Coot (Fulica Americana) nest survival at Grays Lake, Idaho, 1997–2000. The initial candidate set of models included age (IAGE) and date (IDATE) and their quadratic functions; the final candidate set of models included age, date, water depth (WDEPTH), nest vegetation (NESTVEG), and year x treatment (YEAR × TRT) variables, including the quadratic terms for age, date, and water depth. Effective sample size was 11,081.


Models 
LL 
K 
AIC 
ΔAIC 
w 

Initial candidate set of models 
Global model: IAGE, IAGE², IDATE, IDATE² 
609.2 
5 
1228.5 
0 
> 0.99 
IAGE, IAGE², IDATE 
618.2 
4 
1244.4 
15.9 
< 0.01 
IAGE, IAGE² 
632.0 
3 
1270.0 
41.5 
< 0.01 






Final candidate set of models 
IAGE, IAGE², IDATE, IDATE², YEAR × TRT,
WDEPTH, WDEPTH² 
548.8 
22 
1141.6 
0 
0.58 
IAGE, IAGE², IDATE, IDATE², YEAR × TRT,
WDEPTH 
550.8 
21 
1143.7 
2.0 
0.21 
Global model: IAGE, IAGE², IDATE, IDATE²,
YEAR × TRT, WDEPTH, WDEPTH², NESTVEG 
548.2 
24 
1144.5 
2.9 
0.14 


