Overview of the observed distributions of feature values for data set 1.

<p>The value distributions are shown separately for recordings that were classified as good (red), intermediate (green) or bad (blue) by expert 1. We have compared the distributions with Kolmogorov-Smirnov tests and found that many but not all distributions differ significantly on significance level α = 0.05 (one star) or α = 0.01 (two stars). We note that the distributions between intermediate and bad recordings rarely differ significantly but often both do differ from the good recordings.