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Figure 2 The normalized mean absolute deviation (MAD) takes the sum of the difference between two mean subtracted waveforms and divides by the sum of the area under the curve of the two waveforms. The correlation coefficient ( ) is calculated in the standard fashion (see text for formulas). For two completely opposite waveforms (top right panel), the MAD score therefore = 1 and the = –1. For two identical waveforms (middle right panel) the MAD score = 0 and = 1. The MAD score tends to be more sensitive to this amplitude difference between waveforms of similar morphology than the (bottom right panel). Two waveforms of similar morphology with one containing one-third the area of the other have a of 1 but a MAD of only 0.5.
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