Table 2.

$\mathrm{\Delta }$AIC values and effective degrees of freedom (EDF) for the different HGAM formulations, that is the difference in AIC between each of the models and the best-fitting model (i.e. a value of zero corresponds to the preferred model).

model	$\mathrm{\Delta }$AIC	EDF
G	10330.2	399.8
I	908.7	859.3
S	1553.2	615.8
GI	0	980.9
GS	1569.3	673.4