Table 3. Song variables that predicted the two age classes by GLMs (age as binary dependent variable, yearlings vs. older males).

Dependent variable: Age (Nyearling = 8, Nolder = 13)
Predictors	Estimate	SE	z	P-value
Full model
Intercept	27.01	19.13	−1.41	0.16
Amplitude	0.36	0.27	1. 344	0.18
Song rate	−0.31	0.16	−1.85	0.064
Minimum frequency	1.24	2.32	0.54	0.59
Maximum frequency	0.43	0.74	0.59	0.56
Reduced Model
Intercept	−28.67	18.26	−1.57	0.12
Amplitude	0.45	0.25	1.80	0.072
Song rate	−0.26	0.13	−2.07	0.038