Pearson's correlation coefficient in the theory of networks: A comment
نویسندگان
چکیده
In statistics, the Pearson correlation coefficient rx,y determines the degree of linear correlation between two variables and it is known that −1 ≤ rx,y ≤ 1. In the theory of networks, a curious expression proposed in [PRL 89 208701 (2002)] for degree-degree correlation coefficient rji,ki , i ∈ [1,M ] has been in use. We realize that the suggested form is the conventional Pearson’s coefficient for {(ji, ki), (ki, ji)} for 2M data points and hence it is rightly dedicated to undirected networks.
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