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...aph to calculate the index of "centralization" ? I tried my best but can't find it in igraph. The brief introduction to "centralization" can be found here , and I think it's an important index for measuring the centrality on the aggregated level.(http://faculty.ucr.edu/~hanneman/nettext/C10_Centrality.html) Thank you for any comments and suggestions. Best wishes! Weijia [[alternative HTML version deleted]]

...ses to converge, although as mentioned above, I doubt real convergence actually occurred. Problem So by now I guess that the model is really underidentified so I looked for resources to resolve this problem and found: - http://davidakenny.net/cm/identify_formal.htm - http://faculty.ucr.edu/~hanneman/soc203b/lectures/identify.html I followed the 2nd link quite closely and applied the t-rule: - I have 68 observed variables, providing me with 68 variances and 2278 covariances between variables = *2346 data points*. - I also have 68 regression coefficients, 68 error variances of vari...