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Table 3

Correlation coefficient matrix of each impact factor

x1x2x3x4x5x6x7
x1 −0.401 0.103 −0.257 0.432 0.402 0.312 
x2 −0.401 −0.035 0.424 −0.476 −0.464 −0.440 
x3 0.103 −0.035 0.144 0.328 0.326 0.364 
x4 −0.257 0.424 0.144 −0.379 −0.371 −0.332 
x5 0.432 −0.476 0.328 −0.379 0.993 0.969 
x6 0.402 −0.464 0.326 −0.371 −0.993 0.979 
x7 0.312 −0.440 0.364 −0.332 −0.969 0.979 
x1x2x3x4x5x6x7
x1 −0.401 0.103 −0.257 0.432 0.402 0.312 
x2 −0.401 −0.035 0.424 −0.476 −0.464 −0.440 
x3 0.103 −0.035 0.144 0.328 0.326 0.364 
x4 −0.257 0.424 0.144 −0.379 −0.371 −0.332 
x5 0.432 −0.476 0.328 −0.379 0.993 0.969 
x6 0.402 −0.464 0.326 −0.371 −0.993 0.979 
x7 0.312 −0.440 0.364 −0.332 −0.969 0.979 
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