sentences:  Positive values of "r" indicate a correlation between nodes of similar degree, while negative values indicate relationships between nodes of different degree.In general, "r" lies between −1 and 1.When "r" = 1, the network is said to have perfect assortative mixing patterns, when "r" = 0 the network is non-assortative, while at "r" = −1 the network is completely disassortative.