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Relative root mean square error (RRMSE)
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Considering the ground truth or true eye-blink artifact as and the estimated eye-blink artifact obtained by the artifact removal method as , the RRMSE can be defined as
where, N is the number of samples in the signal. When an artifact removal method accurately estimates the eye-blink artifact from the EEG signal, the difference between and (numerator term) will be small and hence RRMSE value is expected to be small for a good artifact removal method.
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