Table 2.
Results of the GLMM, including the following fixed factors: sex (factorial variable: M, males; F, females), age (scale variable), breed (factorial variable: PB, Parma Black; L, Large White; P, Piedmont Black), involvement of the subject in the aggression (R, recipient; A, aggressor; B, bystander).
| Fixed factors | Estimate | SE | z-value | P |
|---|---|---|---|---|
| Intercepta | −1.364 | 1.286 | a | a |
| Sex (M)b | −0.111 | 0.545 | −0.204 | 0.838 |
| Age | 0.065 | 0.072 | 0.907 | 0.365 |
| Breed (PB)b | 0.141 | 0.807 | 0.175 | 0.861 |
| Breed (L)b | 0.931 | 0.765 | 1.172 | 0.241 |
| Involvement (A)b | −1.916 | 0.719 | −2.667 | 0.008 |
| Involvement (B)b | 2.396 | 0.630 | 3.806 | <0.001 |
The coded identity of the subject (nominal) was included as random factor. Full vs. null model: χ2 = 58.384, df = 6, p < 0.001.
a
Not shown as not having a meaningful interpretation.
b
Estimate ± SE refers to the difference of the response between the reported level of this categorical predictor and the reference category of the same predictor.