Degree Correlation r(G)=∑i=1n∑j=i+1n((di−dˉ)(dj−dˉ))A[i,j]∑i=1n(di−dˉ)2r(\boldsymbol{G})=\frac{\sum_{i=1}^{n} \sum_{j=i+1}^{n}\left(\left(d_{i}-\bar{d}\right)\left(d_{j}-\bar{d}\right)\right) A[i, j]}{\sum_{i=1}^{n}\left(d_{i}-\bar{d}\right)^{2}}r(G)=∑i=1n(di−dˉ)2∑i=1n∑j=i+1n((di−dˉ)(dj−dˉ))A[i,j]