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. 2014 Jul 3;4:5547. doi: 10.1038/srep05547

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The comparisons of k_S with k_sum and k_2sum are shown for LJ (a, b), APS (c, d), Facebook (e, f) and Twitter (g, h). Error bars indicate the 95% confidence intervals. To our surprise k_sum has performance comparable with k_S. With more local information, k_2sum improve the performance slightly.