该指数表明在矩阵<math>\mathbf{M}</math>的总功率中,第一个可分离矩阵所占的比例。<ref>{{citation|last1= Depireux | first1= D. A.|last2= Simon|first2= J. Z.|last3= Klein|first3= D. J.|last4= Shamma|first4= S. A. |date=March 2001| title="Spectro-temporal response field characterization with dynamic ripples in ferret primary auditory cortex"|journal= J. Neurophysiol|volume= 85 |issue=3|pages= 1220–34| doi=10.1152/jn.2001.85.3.1220 |pmid= 11247991}}</ref>。
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该指数表明在矩阵<math>\mathbf{M}</math>的总能量中,第一个可分离矩阵所占的比例。<ref>{{citation|last1= Depireux | first1= D. A.|last2= Simon|first2= J. Z.|last3= Klein|first3= D. J.|last4= Shamma|first4= S. A. |date=March 2001| title="Spectro-temporal response field characterization with dynamic ripples in ferret primary auditory cortex"|journal= J. Neurophysiol|volume= 85 |issue=3|pages= 1220–34| doi=10.1152/jn.2001.85.3.1220 |pmid= 11247991}}</ref>。