Table 2.

The structure and performance of the models used to assess the relationships between grooming allocation (P_G), standardized rank distance (StdRank diff) and troop identity (troop). χ² is used to test whether terms have coefficients that differ from zero and asterisks marks terms with coefficients significantly different from zero.

model	d.f.	log likelihood		AIC	ΔAIC
1. PG ∼ 1	2	−10 719		21 441	932
2. PG ∼ StdRank_diff	3	−10 629		21 265	756
3. PG ∼ troop	6	−10 717		21 445	935
4. PG ∼ StdRank_diff + troop	7	−10 628		21 270	761
5. PG ∼ StdRank_diff × troop	11	−10 244		20 509	0