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Omega bankruptcy for different Lévy models

100%
Kaszubowski A.
Śląski Przegląd Statystyczny
|
2019
|
issue 17 (23)
31-58
EN
In this paper, we consider the so-called Omega bankruptcy model, which can be seen as an alternative to the classical approach to ruin. In contrast to the classical model, we allow the process to go below the level zero, however not further than some fixed level −𝑑<0. In addition, when the process is below zero it can be killed with some intensity function 𝜔. Our aim is to show the relations between the Omega model and classical ruin for two important Lévy models, i.e. we consider the Crámer-Lundberg process and the Markov modulated Brownian motion. We also provide numerical experiments to confirm obtained analytical results.
2
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Proportional reinsurance for fractional Brownian risk model

63%
Kępczyński K.
Śląski Przegląd Statystyczny
|
2020
|
issue 18 (24)
EN
This paper investigates the ruin probabilities for a two-dimensional fractional Brownian risk model with a proportional reinsurance scheme. The author focused on the joint and simultaneous ruin probabilities in a finite-time horizon. The risk processes of both insurance and reinsurance companies are composed of a large number of i.i.d. sub-risk processes, representing independent businesses. The asymptotics were derived as the initial capital tends to infinity.
PL
Artykuł bada prawdopodobieństwa ruiny w dwuwymiarowym ułamkowo brownowskim modelu ryzyka w schemacie reasekuaracji proporcjonalnej. Autor skupił się na prawdopodobieństwach ruin łącznej oraz symultanicznej w skończonym horyzoncie czasu. Procesy ryzyka firm ubezpieczeniowej oraz reasekuracyjnej składają się z dużej liczby i.i.d procesów podryzyka reprezentujących niezależne biznesy. W pracy zostały wyznaczone asymptotyki, gdy kapitał początkowy dąży do nieskończoności.
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