?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Feprints.imtlucca.it%2F2189%2F&rft.title=Cluster+analysis+of+weighted+bipartite+networks%3A+a+new+copula-based+approach&rft.creator=Chessa%2C+Alessandro&rft.creator=Crimaldi%2C+Irene&rft.creator=Riccaboni%2C+Massimo&rft.creator=Trapin%2C+Luca&rft.subject=HB+Economic+Theory&rft.subject=QA+Mathematics&rft.description=In+this+work+we+are+interested+in+identifying+clusters+of+%22positional+equivalent%22+actors%2C+i.e.+actors+who+play+a+similar+role+in+a+system.+In+particular%2C+we+analyze+weighted+bipartite+networks+that+describes+the+relationships+between+actors+on+one+side+and+features+or+traits+on+the+other%2C+together+with+the+intensity+level+to+which+actors+show+their+features.+The+main+contribution+of+our+work+is+twofold.+First%2C+we+develop+a+methodological+approach+that+takes+into+account+the+underlying+multivariate+dependence+among+groups+of+actors.+The+idea+is+that+positions+in+a+network+could+be+defined+on+the+basis+of+the+similar+intensity+levels+that+the+actors+exhibit+in+expressing+some+features%2C+instead+of+just+considering+relationships+that+actors+hold+with+each+others.+Second%2C+we+propose+a+new+clustering+procedure+that+exploits+the+potentiality+of+copula+functions%2C+a+mathematical+instrument+for+the+modelization+of+the+stochastic+dependence+structure.+Our+clustering+algorithm+can+be+applied+both+to+binary+and+real-valued+matrices.+We+validate+it+with+simulations+and+applications+to+real-world+data.+&rft.publisher=IMT+Institute+for+Advanced+Studies+Lucca&rft.date=2014-04&rft.type=Working+Paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Feprints.imtlucca.it%2F2189%2F1%2FEIC_WP_3_2014.pdf&rft.identifier=++Chessa%2C+Alessandro+and+Crimaldi%2C+Irene+and+Riccaboni%2C+Massimo+and+Trapin%2C+Luca++Cluster+analysis+of+weighted+bipartite+networks%3A+a+new+copula-based+approach.++EIC+working+paper+series++%233%2F2014++++IMT+Institute+for+Advanced+Studies+Lucca+++++++++