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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Anim Behav. 2010 Mar;79(3):727–734. doi: 10.1016/j.anbehav.2009.12.028

Table 3.

Optimized generalized linear model (lowest AIC value) for the proportion of feeding attempts that eastern bluebird fathers directed towards sons (out of their total feeding attempts).

Parameter Estimate Standard
Error		 Wald 95%
Confidence Limits		 Chi-
Square		 P
value
Intercept − 0.12 0.10 −0.31 0.07 1.52 0.22
aMother breast PC1 − 0.24 0.09 −0.42 −0.06 7.04 0.01
aFather breast PC1 0.22 0.10 0.03 0.40 5.20 0.02
a

Principal component plumage colour scores for the respective body regions