Lerby Ergun

Senior Economist

Lerby Ergun is Senior Economist in the Financial Markets Department of the Bank of Canada. His primary research focusses on measuring risk in financial markets and recently started focussing on information flows in OTC markets. Before joining the Bank, Lerby worked as a Research Officer at the Systemic Risk Centre in the LSE. He received his PhD from Erasmus University Rotterdam, on the topic “Fat Tail in Financial Markets”.


Senior Economist
Financial Markets
Market Risks and Vulnerabilities

Bank of Canada
234 Wellington Street
Ottawa, ON, K1A 0G9


Tail Index Estimation: Quantile-Driven Threshold Selection

The most extreme events, such as economic crises, are rare but often have a great impact. It is difficult to precisely determine the likelihood of such events because the sample is small.

Challenges in Implementing Worst-Case Analysis

Staff Working Paper 2018-47 Jon Danielsson, Lerby Ergun, Casper G. de Vries
Worst-case analysis is used among financial regulators in the wake of the recent financial crisis to gauge the tail risk. We provide insight into worst-case analysis and provide guidance on how to estimate it. We derive the bias for the non-parametric heavy-tailed order statistics and contrast it with the semi-parametric extreme value theory (EVT) approach.
Content Type(s): Staff Research, Staff Working Papers Topic(s): Financial stability JEL Code(s): C, C0, C01, C1, C14, C5, C58

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  • Ph.D, Erasmus University Rotterdam (2015)
  • M.A. Vrije Uniniversity Amsterdam (2008)
  • B.A. Vrije Uniniversity Amsterdam (2006)

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