Super User

Super User

Conspiracy Terms

Thursday, 04 February 2016 00:00 Published in Dolfin Home

Backbone of conspiracy terms co-occurence network. Different colors indicate nodes belonging to different semantic category according to the output of the supervised tagging. In particular, purple nodes belong to geopolitics, red nodes to environment, blue nodes to health, and green to diet.

Bessi, Alessandro, Fabiana Zollo, et al. 2015. “Trend of Narratives in the Age of Misinformation.” PloS one 10(8):e0134641. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134641

 

Interbank Network

Thursday, 04 February 2016 00:00 Published in Dolfin Home

The interbank network as a multiple network. A schematic representation of the balance sheets of three banks akin to that of Fig. 12.2 is reported. The first layer (light blue color, on the left) represents the exposures banks have to common assets. Shocks on this part of the nexus will impair the asset side of the banks forcing for a balance sheet reduction. The layer in the center (light orange) represents the “traditional” interbank lending. The last layer on the right (light red) represents the CDS network, where pairs of banks are connected if they engage in one of these contracts (links in red). Interestingly, other banks can be the reference entity for a contract (links in purple).

Source: Garas, A. "Interconnected networks." (2016). Chapter 12. "The Financial System as a Nexus of Interconnected Networks", by Stefano Battiston, Guido Caldarelli, and Marco D’Errico. http://www.springer.com/us/book/9783319239453

Tweets & Elections

Thursday, 04 February 2016 00:00 Published in Dolfin Home

Daily tweet volume for each party around elections. The ordering of parties (i.e., the numbers in parentheses) is based on actual ranking in the election. (A) Euro14. 1st: PD. 2nd: M5S. 3rd: FI. 4th: LN. 5th: NCD-UdC. 6th: AET. 7th: FdI-AN. (B) Italy13. 1st: M5S. 2nd: PD. 3rd: PdL. 4th: SC. 5th: LN. 6th: SEL. (C) Bulgaria13. 1st: GERB. 2nd: BSP. 3rd: DPS. 4th: ATAKA.

Eom, Young-Ho, Michelangelo Puliga, Jasmina Smailović, Igor Mozetič, and Guido Caldarelli. 2015. “Twitter-Based Analysis of the Dynamics of Collective Attention to Political Parties.” PloS one 10(7):e0131184. http://journals.plos.org/plosone/article?id=10.137

Vulnerability & Impact

Thursday, 04 February 2016 00:00 Published in Dolfin Home

Individual vulnerability vs individual impact (2008 and 2013) Circle size reflects asset size, colors reflect the magnitude of the interbank leverage. The four quadrants divide the banks into four categories.

Battiston, Stefano, Guido Caldarelli, Marco D’errico, and Stefano Gurciullo. 2015. “Leveraging the Network : A Stress-Test Framework Based on DebtRank.” ArXiv 1–33. http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2571218.

Contract network

Thursday, 04 February 2016 00:00 Published in Dolfin Home

Example of contract network among three banks. Each bank balance sheet consists of assets and liabilities. The assets of one bank are liabilities of another bank. (Top) Credit contracts are represented as arrows (pale red) from the lender to the borrower. Pale blue arrows represent investment in assets issued by entities external to the banking system. (Bottom) Derivative contracts are represented as orange arrows from the seller to the buyer, while the reference entity is indicated by the violet dashed arrow.

Battiston, S., Caldarelli, G., May, R., Roukny, T., & Stiglitz, J. E. (2015). The Price of Complexity in Financial Networks. Available at SSRN 2594028.

Sentiment and polarization

Thursday, 04 February 2016 00:00 Published in Dolfin Home

Probability Density Function (PDF) of the mean sentiment of polarized users having commented at least twice, where −1 corresponds to negative sentiment, 0 to neutral and 1 to positive.

Zollo, F. et al. 2015. “Emotional Dynamics in the Age of Misinformation.” PLoS ONE 10(9):e138740. http://dx.doi.org/10.1371/journal.pone.0138740