Table 2. Alternative model selection results.

MilTech	MilTech.sq	Scale	SocSoph	IronCav	Agri	WorldPop	Centrality	Phylogeny	ΔAIC
42.11	-6.86			3.97	2.54	3.50	3.38	4.49	0.00
41.83	-6.70	-0.61		4.02	2.61	3.51	3.40	4.43	1.63
41.77	-6.74		0.20	3.92	2.38	3.51	3.37	4.47	1.96
41.74	-6.73	-0.98	0.79	3.97	2.43	3.57	3.42	4.32	3.00

The table shows t-statistics associated with each of the predictors (column headings) for the best models with ΔAIC (the AIC difference with respect to the best model) less than 2. The best model by AIC is included as the top row. An empty entry indicates that the term associated with this predictor is not included in the model.