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Orestis Chrysafis
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  • London
  • United Kingdom
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  • Vincent Granville

Orestis Chrysafis's Discussions

Random Forests vs MARS vs Linear regression

Started this discussion. Last reply by Vincent Granville Feb 25, 2015. 2 Replies

Hi all, I would like to get the group's view on the advantages and disadvantages of Random Forests and MARS modelling vs Linear regression. It would be interesting to compare them both at a…Continue

Tags: Econometrics, Random Analytics, MARS, Regression


Welcome, Orestis Chrysafis!

Profile Information

Leading Online Games Provider
Director, Other
Job Function:
Business Analytics, Predictive Modeling, Statistical Programming, Web Analytics, Statistical Consulting, Other
Short Bio:
Analytics Consultant & Solutions Architect

- Inventor of the `Annex Algorithm' for dynamic Web communities identication.
- Inventor of the `Orange Model' of complex evolving networks.
- Principal contributor and intellectual co-owner of the Chrysas-Cannings equation.

Current role:
Data Science Director, Omnicom Group

Past roles:
- Head of Insights at Zeebox
- Senior Finance manager, Lead Analyst at Pokerstars
- Head of Analytics at Autoquake Ltd.
- Quantitative Models Researcher at Onalytica Ltd.

PhD Mathematics & Statistics, University of Sheffield.
MSc Statistics, University College Dublin.
Ptychion (BSc+) Mathematics, University of Patras.

White paper : "Using the The Internet As a Market Research Database", J. Dalrymple, O. Chrysafis.
Article: O. Chrysafis, C. Cannings, "Weighted self-similar networks under preferential attachment", Physica A, Volume 388, Issue 14, 2009.

Selected Presentations:
"The shape of the World Wide Web", Amorph Workshop 2009, Royal Holloway London.
"Mathematical modeling of weighted evolving networks", Conference MASAMB 2008.
"Exact solution of the joint degree distribution of a scale-free graph". Amorph Workshop 2007, University of Leeds.
Presentation: "Analysis of the Irish demographic time series 1974-2004", Conference CASI 2006 (prize winner).

Currently engaged in:
- Attribution modelling
- Big Data
- Acquisition Analytics

Interested in:
- R
- Network Science
- Game Theory
- Stochastic modelling
LinkedIn Profile:
Networking, New Venture, Other

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