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Beal, Josual accepted dissertation 04-25-13 Su 13.pdf (351.81 KB)
ETD Abstract Container
Abstract Header
Matching Problems for Stochastic Processes
Author Info
Beal, Joshua M
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367500889
Abstract Details
Year and Degree
2013, Doctor of Philosophy (PhD), Ohio University, Mathematics (Arts and Sciences).
Abstract
This dissertation investigates the nature of the 2-D mimicking or matching problem, where the objective is to show the existence of a stochastic process Y that has the same joint (2-D) distributions as a given stochastic process X. Typically, the goal is to `match’ X with a process Y having desirable properties such as the Markov and/or the martingale property. Much attention has already been given to 1-D matching problems where the aim is to match X with a process Y having the same one dimensional (1-D) distributions, or marginals, as X. The discussion below addresses the more general notion of matching in 2 or N dimensions. We generalize a theorem due to Strassen that provides conditions under which given probability measures are the marginals of some distribution lying in a closed convex set. Specifically, our generalization provides conditions under which given probability measures agree with the 2-D distributions of a process of projections. Following this generalization, we apply our theorem to prove statements related to the existence of martingales with pre-defined 2-D distributions. We demonstrate that the 2-D matching problem is suciently robust by providing an example of a discrete time (non-martingale) process matching the 2-D distributions of a martingale. An ordering schema is also given which implies necessary conditions for 2-D matching. In the 1-D setting, we give conditions under which the product measure is a martingale measure, and later analyze problems related to local martingales. Lastly, we show that the space of N-D distributions of an N-step process X with values in a finite set is the convex hull of all measures for which X is Markov.
Committee
Archil Gulisashvili, Dr. (Advisor)
Pages
79 p.
Subject Headings
Mathematics
Keywords
martingale
;
Markov
;
stochastic process
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Citations
Beal, J. M. (2013).
Matching Problems for Stochastic Processes
[Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367500889
APA Style (7th edition)
Beal, Joshua.
Matching Problems for Stochastic Processes.
2013. Ohio University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367500889.
MLA Style (8th edition)
Beal, Joshua. "Matching Problems for Stochastic Processes." Doctoral dissertation, Ohio University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367500889
Chicago Manual of Style (17th edition)
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Document number:
ohiou1367500889
Download Count:
909
Copyright Info
© 2013, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.