Table 2

Individual vocal cue classification

Group

#^a

Random (%)^b

Whole call CV-values (%)

Noisy segment CV-values (%)

Harmonic segment CV-values (%)

1B

8

12.5

48.1***

45.0***

25.0

1H

14

7

26.1*

40.0***

11.4

11

7

14

42.0***

48.0***

22.0

15

7

14

61.5***

61.1***

22.5

The percentage of correct classification after cross-validation (CV) to individuals within each of the four study groups compared to that expected by chance; Results for the whole call, noisy segment and harmonic segment are given; p-values are derived from bootstrapping method [46]; ^• p ≤ 0.1, * p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001

^a Number of individuals tested

^b Expected by chance.

Jansen et al. BMC Biology 2012 10:97   doi:10.1186/1741-7007-10-97