collaborators

5 papers

cs.LG2026

WANDR: A Benchmark for Wide and Deep Research

Vitaliy Polshkov, Marcin Pitera, Jeremy Yang +7

WANDR (Wide ANd Deep Research) is a benchmark of 500 realistic, challenging data-collection tasks for research agents. Each task requires a system to discover a large set of entiti…

q-fin.RM2026

Coherent estimation of risk measures

Martin Aichele, Igor Cialenco, Damian Jelito +1

We develop a statistical framework for risk estimation, inspired by the axiomatic theory of risk measures. Coherent risk estimators -- functionals of P\&L samples inheriting the ec…

math.OC2026

Blackwell optimality in risk-sensitive stochastic control

Marcin Pitera, Łukasz Stettner

In this paper, we consider a discrete-time Markov Decision Process (MDP) on a finite state-action space with a long-run risk-sensitive criterion used as the objective function. We…

math.OC2026

Policy stability and ultimate stationarity in discounted risk-sensitive stochastic control

Nicole Bäuerle, Nicole Bäuerle, Marcin Pitera +2

We study discrete-time Markov Decision Processes (MDPs) on finite state-action spaces and analyze the stability of optimal policies and value functions in the long-run discounted r…

q-fin.PM2025

Statistical applications of the 20/60/20 rule in risk management and portfolio optimization

Kewin PÄ czek, Damian Jelito, Marcin Pitera +1

This paper explores the applications of the 20/60/20 rule-a heuristic method that segments data into top-performing, average-performing, and underperforming groups-in mathematical…