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Decision making in stochastic extensive form I: Stochastic decision forests

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  • E. Emanuel Rapsch

Abstract

A general theory of stochastic decision forests reconciling two concepts of information flow -- decision trees and refined partitions on the one hand, filtrations from probability theory on the other -- is constructed. The traditional "nature" agent is replaced with a one-shot lottery draw that determines a tree of a given decision forest, while each "personal" agent is equipped with an oracle providing updates on the draw's result and makes partition refining choices adapted to this information. This theory overcomes the incapacity of existing approaches to extensive form theory to capture continuous time stochastic processes like Brownian motion as outcomes of "nature" decision making in particular. Moreover, a class of stochastic decision forests based on paths of action indexed by time is constructed, covering a large fraction of models from the literature and constituting a first step towards an approximation theory for stochastic differential games in extensive form.

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  • E. Emanuel Rapsch, 2024. "Decision making in stochastic extensive form I: Stochastic decision forests," Papers 2404.12332, arXiv.org.
    • Handle: RePEc:arx:papers:2404.12332
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    References listed on IDEAS

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