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. 2020 Nov 4;20(21):6285. doi: 10.3390/s20216285

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Box plots showing example power variation within two subjects. The variations occurred due to the selection of choices available in artifact removal (a,f), EEG transformation (b,g), filter (c,h), time-window (d,i), and PSD estimation method (e,j). Powers were computed from the EEG signals of two random subjects from Dataset 1 (a–e) and Dataset 2 (f–j), respectively. Each subfigure represents the effect of choices available in a factor for the subject. The other factors were kept constant as follows: artifact removal = yes, EEG transformation = raw, filter = Butterworth, time window = 750 ms, method = Welch’s method. The boxes indicate the quartiles of the samples while the whiskers extend to show the rest of the distribution up to 1.5 inter-quartile range. Significant models from Table 1 are indicated in the figure using asterisks (*) near the frequency band names.