Table 1.

Minimum adequate model for focal group (a) total agonistic index (TAI) and (b) per capita agonistic index (PCAI).

(a) AIC = 1262
random effects	variance	s.d.
dyad	0.057	0.238
fixed effects	estimate	s.e.	z value	p
intercept	2.342	0.167	14.02	<0.0001
body mass difference	0.120	0.022	5.55	<0.0001
focal group = 10	−0.259	0.136	−1.91	0.056
focal group = 20	0.810	0.122	6.66	<0.0001
opponent group = 10	0.027	0.144	0.18	0.854
opponent group = 20	0.487	0.130	3.76	<0.001
opponent group TAI	−0.072	0.012	−6.01	<0.0001
body mass difference × focal group size = 10	0.064	0.025	2.60	0.009
body mass difference × focal group size = 20	−0.073	0.022	−3.38	<0.001
body mass difference × opponent group size = 10	−0.012	0.021	−0.55	0.584
body mass difference × opponent group size = 10	−0.089	0.021	−4.19	<0.0001
focal group = 10 × opponent group = 10	−0.150	0.201	−0.75	0.455
focal group = 10 × opponent group = 20	0.480	0.177	2.72	0.007
focal group = 20 × opponent group = 10	−0.248	0.162	−1.53	0.127
focal group = 20 × opponent group = 10	−0.335	0.163	−2.05	0.041
focal group = 10 × opponent group TAI	0.022	0.007	2.93	0.003
focal group = 20 × opponent group TAI	0.023	0.007	3.22	0.001
opponent group = 10 × opponent group TAI	0.051	0.011	4.49	<0.0001
opponent group = 20 × opponent group TAI	0.034	0.011	3.06	0.002
(b) AIC = 174.8
random effects	variance	s.d.
dyad	0.073	0.270
fixed effects	estimate	s.e.	z value	p
intercept	0.724	0.204	3.54	<0.001
body mass difference	0.100	0.026	3.80	<0.001
focal group = 10	−0.603	0.190	−3.17	0.002
focal group = 20	−0.717	0.195	−3.68	<0.001
opponent group PCAI	−0.154	0.083	−1.85	0.065