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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