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. 2011 Apr 13;6(4):e18466. doi: 10.1371/journal.pone.0018466

Table 1. Potential for individual identity coding and repeatabilities for ten acoustic parameters from 493 calls of 84 individuals.

Potential for individual identity coding Repeatabilities
Acoustic parameters mean±SD (untransformed) meanCVi CVb PIC R Confidence interval
Duration (ms) 210.24±62.66 17.56 35.53 2.02 0.83 0.81–0.86
Amplitude Mean 32.47±4.83 21.60 40.70 1.88 0.85 0.83–0.89
Amplitude modulation (1/ms) Variance (5.06±2.56)×10−3 24.90 45.86 1.84 0.82 0.80–0.85
Frequency (Hz) Mean 3933.65±411.20 22.34 32.79 1.47 0.73 0.68–0.77
Frequency modulation Mean 11.78±6.39 15.89 30.50 1.92 0.81 0.78–0.82
Frequency modulation Variance 286.62±121.03 24.13 35.82 1.48 0.75 0.68–0.81
Entropy Mean −2.51±0.44 14.53 28.05 1.93 0.80 0.77–0.82
Entropy Variance 0.29±0.15 28.75 35.76 1.24 0.66 0.63–0.71
Pitch (Hz) Mean 619.68±66.53 13.06 35.37 2.71 0.88 0.85–0.90
Pitch goodness Mean 829.94±314.53 18.66 40.62 2.18 0.86 0.82–0.86