no code implementations • 14 Jan 2022 • Çağın Ararat, Barış Bilir, Elisa Mastrogiacomo
The notion of convexity index, defined in 1980s for finite-dimensional vector spaces, plays a crucial role in the discussion of decomposable sums.
no code implementations • 23 Oct 2021 • Çağın Ararat, Francesco Cesarone, Mustafa Çelebi Pınar, Jacopo Maria Ricci
In this paper, we investigate the features and the performance of the Risk Parity (RP) portfolios using the Mean Absolute Deviation (MAD) as a risk measure.
no code implementations • 23 Oct 2021 • Çağın Ararat, Cem Tekin
We introduce vector optimization problems with stochastic bandit feedback, in which preferences among designs are encoded by a polyhedral ordering cone $C$.
no code implementations • 29 Aug 2021 • Çağın Ararat, Mücahit Aygün
Motivated by the problem of finding dual representations for quasiconvex systemic risk measures in financial mathematics, we study quasiconvex compositions in an abstract infinite-dimensional setting.
no code implementations • 11 Dec 2020 • Çağın Ararat
We study a static portfolio optimization problem with two risk measures: a principle risk measure in the objective function and a secondary risk measure whose value is controlled in the constraints.
1 code implementation • 24 Jun 2020 • Andi Nika, Kerem Bozgan, Sepehr Elahi, Çağın Ararat, Cem Tekin
We consider the problem of optimizing a vector-valued objective function $\boldsymbol{f}$ sampled from a Gaussian Process (GP) whose index set is a well-behaved, compact metric space $({\cal X}, d)$ of designs.
no code implementations • 14 Dec 2019 • Çağın Ararat, Zachary Feinstein
Scalar dynamic risk measures for univariate positions in continuous time are commonly represented as backward stochastic differential equations.
no code implementations • 25 Mar 2019 • Tahsin Deniz Aktürk, Çağın Ararat
We provide analytical results for a static portfolio optimization problem with two coherent risk measures.
no code implementations • 20 Mar 2019 • Çağın Ararat, Nurtai Meimanjan
Systemic risk is concerned with the instability of a financial system whose members are interdependent in the sense that the failure of a few institutions may trigger a chain of defaults throughout the system.