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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: J Voice. 2012 Apr 18;26(5):566–576. doi: 10.1016/j.jvoice.2011.09.006

Figure 5.

Figure 5

Comparison of linear (i.e., time-domain based perturbation) and nonlinear approaches to the acoustic analysis of voice signals from patients with vocal fold scar and sulcus vocalis and controls. A: Jitter. B: Shimmer. C: Signal-to-noise ratio (SNR). D: Correlation dimension (D2). Type 1 signals are represented by purple open circles; type 2 signals are represented by green closed circles; type 3 signals are represented by red closed circles. Statistical p-values are presented for type 1 signal data only (n = 20 in the control group; n = 3 in the scar/sulcus group) and for all data (n = 23 in each group).