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Table 2 ECG segments correlation representation

From: Statistical and spectral analysis of ECG signal towards achieving non-invasive blood glucose monitoring

ConditionExpressionPattern representation
Positive correlation\( {R}_{a^i{b}^i}>0 \)Positive (P)
Negative correlation\( {R}_{a^i{b}^i}<0 \)Negative (N)
No (Zero) correlation\( {R}_{a^i{b}^i}=0 \)Zero (Z)