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Table 2 Component matrix with loadings of the PCA

From: Calls during agonistic interactions vary with arousal and raise audience attention in ravens

Acoustic Variable

Principal Components

 

1

2

3

Mean fo (Hz)

0.97

0.18

0.08

Minimum fo (Hz)

0.97

0.09

−0.01

Maximum fo (Hz)

0.94

0.20

0.07

End fo (Hz)

0.93

0.10

−0.01

Start fo (Hz)

0.93

0.08

−0.02

Mean amplitude (dB)

0.17

0.97

0.15

Maximum amplitude (dB)

0.19

0.96

0.13

Minimum amplitude (dB)

0.10

0.96

0.17

Jitter

−0.16

−0.08

−0.90

Tonality

−0.14

0.29

0.84

% of variance explained

51.62

27.59

12.19

Eigenvalue

5.16

2.76

1.22

  1. The dimension of the acoustic variables measured from defensive calls (N = 377) were reduced to three PCs. Loading higher than 0.5 are highlighted in bold