Table 3.

Comparisons of models allowing for differences between host–parasite combinations to basal models with a chi-squared test.

Model 1: Model 2	−2(l(Model 1)−l(Model 2))	d.f.	Pr-value
mass-action: mass-action+combinations	67.8	4	7×10−14
parasite antagonism: parasite antagonism+combinations	11.2	8	0.19
heterogeneous host: heterogeneous host+combinations	7.8	8	0.45