In this paper we introduce a model of default contagion in the financail market. The structure of the companies are represented by a Heavy Gravity Portfolio, where we assume there are N sectors in the market and in each sector i, there is one big trader and ni supply companies.The supply companies in each sector are directly inuenced by the bigtrader and the big traders are also pairwise interacting with each other.This development of the Ising model is called Heavy gravity portfolioand according to this, the relation between expectation and correlationof the default of companies are derived by means of simulations utilisingthe Gibbs sampler. Finally methods for maximum likelihood estimationand for a likelihood ratio test of the interaction parameter in the modelare derived.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hh-16459 |
| Date | January 2011 |
| Creators | Zhao, Yang, Zhang, Min |
| Publisher | Högskolan i Halmstad, Tillämpad matematik och fysik (MPE-lab), Högskolan i Halmstad, Tillämpad matematik och fysik (MPE-lab) |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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