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Table 2 Factor loadings of the measured acoustic parameters on the first five principal components.

From: Quality prevails over identity in the sexually selected vocalisations of an ageing mammal

 

Principal Component

Acoustic variable

1

2

3

4

5

F0max

0.39

0.84

0.04

0.03

0.26

F0mean

0.35

0.89

-0.10

-0.12

-0.06

F0min

0.12

0.68

-0.23

-0.27

-0.54

Jitter

0.26

0.29

0.00

0.46

0.74

Duration

0.00

-0.22

0.95

-0.17

0.03

Pulses

0.21

0.32

0.87

-0.27

-0.05

Frmax

0.16

-0.05

0.05

0.27

-0.08

F1min

0.07

0.12

0.20

0.64

-0.27

F2min

-0.06

0.26

0.31

0.57

-0.25

F3min

-0.51

0.03

0.04

0.41

-0.31

F4min

-0.80

0.29

0.04

-0.15

0.21

F5min

-0.92

0.15

-0.01

-0.01

0.00

F6min

-0.86

0.26

0.05

-0.06

0.14

Dfmin

-0.96

0.26

0.05

0.03

0.05

Eigenvalue

1.96

1.59

1.37

1.19

1.11

Cum % variance

27.30

45.30

58.70

68.80

77.50

  1. Bold types indicate the heaviest factor loadings (|r| >0.50). Eigenvalues and cumulative explained variances are given at the bottom of the table.
  2. Correlated parameters of the calls are clustered into five principal components (eigenvalue >1) generated by a PCA carried out on the 2000, 2002, 2003 and 2004 recordings. Each principal component reflects a different constituent of the sound production apparatus
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BMC Biology

ISSN: 1741-7007

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