AIC = -167.00 Gradient: (1, 138) = 29.07, < 0.0001; significantly improves explanatory power and F p should be retained as a fixed factor Relational disparity: (1, 138) = 29.64, < 0.0001; same as above F p Model 3: Three predictors, varies, and are fixed r g f AIC = -205.15 Gradient: (1, 136) = 31.41, < 0.0001; same as above F p Relational disparity: (2, 136) = 17.77, < 0.0001; same as above F p Familiarity: (1, 136) = 3.97, = 0.048; significantly improves explanatory power, but it F p is not yet clear whether its strength should vary across the groups Model 4: Three predictors, and vary, is fixed r f g AIC = -205.15 Gradient: (1, 136) = 31.41, < 0.0001; same as above F p Relational disparity: (2, 136) = 17.77, < 0.0001; same as above F p Familiarity: (1, 136) = 3.97, = 0.048; significant difference in strength of across F p f groups Final model: All three predictors included, strength of is constant, strength of both and vary g r f across groups Appendix C, Bubble charts of to individual testing pairs pigeons’ responses Experiment 1: Size discrimination
AIC = -167.00 Gradient: F (1, 138) = 29.07, p < 0.0001; significantly improves explanatory power and should be retained as a fixed factor Relational disparity: F (1, 138) = 29.64, p < 0.0001; same as above Model 3: Three predictors, r varies, g and f are fixed AIC = -205.15 Gradient: F (1, 136) = 31.41, p < 0.0001; same as above Relational disparity: F (2, 136) = 17.77, p < 0.0001; same as above Familiarity: F (1, 136) = 3.97, p = 0.048; significantly improves explanatory power, but it is not yet clear whether its strength should vary across the groups Model 4: Three predictors, r and f vary, g is fixed AIC = -205.15 Gradient: F (1, 136) = 31.41, p < 0.0001; same as above Relational disparity: F (2, 136) = 17.77, p < 0.0001; same as above Familiarity: F (1, 136) = 3.97, p = 0.048; significant difference in strength of f across groups Final model: All three predictors included, strength of g is constant, strength of both r and f vary across groups Appendix C, Bubble charts of pigeons’ responses to individual testing pairs Experiment 1: Size discrimination