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Table 2 Principal Components with eigenvalues >1 for 28 note-types emitted ≥5 times across the study, where each note-type was emitted by >1 individual of the Lilac-crowned Amazon.

From: Contextual flexibility in the vocal repertoire of an Amazon parrot

  PC1 PC2 PC3
Overall eigenvalues 3.49 2.67 1.76
Explained variation (%) 26.3 23.4 22.3
Variance Pitch 0.805 0.384 0.211
Frequency Modulation 0.794 −0.325 −0.032
Goodness of Pitch −0.704 0.157 0.293
Duration −0.697 −0.104 0.297
Mean Pitch −0.165 0.857 0.158
Low Frequency 0.083 0.775 −0.058
Weiner Entropy 0.531 −0.659 −0.158
Mean frequency 0.483 0.585 0.133
Bandwidth −0.037 0.176 0.942
High frequency −0.026 0.268 0.916
Harmonics −0.287 −0.266 0.663
  1. Bold text highlights variables with greatest weighting for each component (r >0.60)