Table 1.

General linear model analysis of among year variation in relative female preference (log-transformed) for relative male body size and relative nest cover percentage. (Year is a categorical variable (factor), whereas male total length and nest cover are covariates. Values for length and nest cover are expressed as the preferred male relative to the non-preferred male. SS, sum of squares; MS, mean squares.)

source	SS	d.f.	MS	F	p
year	0.314	3	0.105	3.564	0.016
length	0.083	1	0.083	2.836	0.094
nest	0.064	1	0.064	2.173	0.14
year × length	0.317	3	0.106	3.600	0.015
year × nest	0.307	3	0.102	3.484	0.018
length × nest	0.078	1	0.078	2.655	0.11
year × length × nest	0.309	3	0.103	3.515	0.017
error	3.932	134	0.029