Fig. 4
From: Country centrality in the international multiplex network
In red: number of principal components sufficient to explain 90% of the variance of the measures of centrality calculated on the single layers (scale reported on the right y-axis). In blue: mean square error obtained by regressing the multilayer measures of centrality against the principal components of the single layer centralities, added one by one (scale reported on the left y-axis). All results refer to the cross section in 2003, results for the cross section 2010 are available in the Appendix