Universiteit Stellenbosch
Welkom by Universiteit Stellenbosch
Departement Logistiek: Navorsingseminaar
Begin: 08/09/2023, 13:00
Einde: 08/09/2023, 14:00
Kontak:Linke Potgieter -
Plek: MS Teams and VDS3022

Sprekers /Presenters : Dr Mesias Alfeus (SU/Statistics and Actuarial Science)

Titel/Title : Stochastic default risk estimation: Evidence from the South African financial market

Tyd/Time : 13:00 – 14:00, Friday 8th of September 2023

Plek/Location : MS Teams and VDS 3022


The present paper provides empirical studies to estimate defaultable bonds in the South African financial market. The main goal is to estimate the unobservable factors affecting bond yields for South African major banks. The maximum likelihood approach and a global optimisation based on Adaptive Simulated annealing (ASA) are adopted for the estimation methodology. Extended Kalman filtering techniques are employed to tackle the situation that the factors cannot be observed directly. Multi-dimensional Cox-Ingersoll-Ross (CIR)-type factor models are considered. Results show that default risk increased sharply in the South African financial market during COVID-19 and the CIR model with jumps exhibits a better performance.

Joint work with Kirsty Fitzhenry and Alessia Lederer