216 research outputs found
A sparse grid approach to balance sheet risk measurement
In this work, we present a numerical method based on a sparse grid
approximation to compute the loss distribution of the balance sheet of a
financial or an insurance company. We first describe, in a stylised way, the
assets and liabilities dynamics that are used for the numerical estimation of
the balance sheet distribution. For the pricing and hedging model, we chose a
classical Black & Scholes model with a stochastic interest rate following a
Hull & White model. The risk management model describing the evolution of the
parameters of the pricing and hedging model is a Gaussian model. The new
numerical method is compared with the traditional nested simulation approach.
We review the convergence of both methods to estimate the risk indicators under
consideration. Finally, we provide numerical results showing that the sparse
grid approach is extremely competitive for models with moderate dimension.Comment: 27 pages, 7 figures. CEMRACS 201
Hedging Valuation Adjustment for Callable Claims
Darwinian model risk is the risk of mis-price-and-hedge biased toward
short-to-medium systematic profits of a trader, which are only the compensator
of long term losses becoming apparent under extreme scenarios where the bad
model of the trader no longer calibrates to the market. The alpha leakages that
characterize Darwinian model risk are undetectable by the usual market risk
tools such as value-at-risk, expected shortfall, or stressed
value-at-risk.Darwinian model risk can only be seen by simulating the hedging
behavior of a bad model within a good model. In this paper we extend to
callable assets the notion of hedging valuation adjustment introduced in
previous work for quantifying and handling such risk. The mathematics of
Darwinian model risk for callable assets are illustrated by exact numerics on a
stylized callable range accrual example. Accounting for the wrong hedges and
exercise decisions, the magnitude of the hedging valuation adjustment can be
several times larger than the mere difference, customarily used in banks as a
reserve against model risk, between the trader's price of a callable asset and
its fair valuation
Imagined urbanities : L.A. across genres and media at the turn of the twenty first century
ThÚse numérisée par la Direction des bibliothÚques de l'Université de Montréal.[à l'origine dans / Was originally part of : ThÚses et mémoires - FAS - Département de littérature comparée
"It's our home" : expressions de la relation au territoire des Dane-zaa de Doig River (Colombie-Britannique, Canada)
AxĂ© autour du concept de territoire, ce mĂ©moire est une prĂ©sentation de ce que cette notion recouvre pour un groupe de chasseurs-cueilleurs de lâouest canadien. InstallĂ©s depuis des millĂ©naires sur les contreforts des Montagnes Rocheuses au nord-est de la Colombie-Britannique et en Alberta, les Dane-zaa (« le vrai peuple »), intimement engagĂ©s dans cet environnement, ont dĂ©veloppĂ© des savoirs et des techniques spĂ©cifiques adaptĂ©s Ă une gestion logique et durable du territoire et peaufinĂ©s par les gĂ©nĂ©rations successives. La relation entretenue recouvre cependant bien plus quâune exploitation physique puisque les humains et les non-humains, voisins sur un pied dâĂ©galitĂ©, interagissent dans un rapport dâĂ©change et de respect. Depuis lâarrivĂ©e des Euro-canadiens et la signature du TraitĂ© 8 en 1900 lequel ordonna la crĂ©ation dâune rĂ©serve, le territoire des Dane-zaa, cet espace de vie, dâhistoire et de mĂ©moire, sâest vu fragmenter et est devenu le lieu dâenjeux et dâintĂ©rĂȘts politiques et Ă©conomiques souvent divergents et difficilement conciliables.Focused on the concept of land, this masterâs degree thesis is a presentation of what this notion represents for a group of hunter-gatherers of western Canada. Settled for thousands of years on the foothills of the Rocky Mountains in North-East British-Columbia and in Alberta, the Dane-zaa (âThe Real Peopleâ), intimately engaged in their environment, have been developing knowledge and technics adapted to a rational and sustainable land management, generation after generation. However, this relationship does not only concern the exploitation of the resources the land provides, but also the bonds between humans and non-humans who share it. Since the arrival of the first euro-Canadians settlers and the signature of Treaty 8 in 1900 which ordered the creation of a reserve, the land of the Dane-zaa, their âhomeâ and a space of history and memory, has been fragmented and has become the site of political and economic stakes and interests often divergent and which can hardly been reconciled
La fosse du deuxiÚme ùge du Fer des Estanyols (Pia, Pyrénées-Orientales)
Depuis une vingtaine dâannĂ©es, le dĂ©veloppement considĂ©rable de lâarchĂ©ologie prĂ©ventive a permis dâinvestir de maniĂšre bien plus large les espaces ruraux. Parmi les vestiges observĂ©s, un type dâamĂ©nagement excavĂ© se rencontre assez rĂ©guliĂšrement. Toutefois, malgrĂ© de nouveaux Ă©lĂ©ments recueillis, notamment lors de la fouille fine dâune telle structure sur le site des Estanyols Ă Pia (66), mise en perspective avec dâautres fosses identifiĂ©es dans la plaine roussillonnaise, sa fonction reste difficile Ă dĂ©terminer. De mĂȘme, le lien quâelle peut entretenir avec lâhabitat est encore mal apprĂ©hendĂ©, quoique plusieurs indices tendent Ă montrer quâelle puisse faire partie de lâĂ©quipement annexe de certains Ă©tablissements ruraux protohistoriques.Since the 1990âs, considerable development of preventive archeology has invested much more broadly rural areas. Among all vestiges observed, a particular type of pit appears regularly. However, despite new evidence collected, especially during the excavation of such a fine structure on the site des Estanyols (Pia, 66), put into perspective with other pits identified in the Roussillon plain, its function remains unclear. Similarly, the relationship it may have with the habitat is still poorly understood, although several indices suggest that it can be part of the ancillary equipment of some protohistoric rural settlements
An optimal transport approach for the multiple quantile hedging problem
We consider the multiple quantile hedging problem, which is a class of
partial hedging problems containing as special examples the quantile hedging
problem (F{\"o}llmer \& Leukert 1999) and the PnL matching problem (introduced
in Bouchard \& Vu 2012). In complete non-linear markets, we show that the
problem can be reformulated as a kind of Monge optimal transport problem. Using
this observation, we introduce a Kantorovitch version of the problem and prove
that the value of both problems coincide. In the linear case, we thus obtain
that the multiple quantile hedging problem can be seen as a semi-discrete
optimal transport problem, for which we further introduce the dual problem. We
then prove that there is no duality gap, allowing us to design a numerical
method based on SGA algorithms to compute the multiple quantile hedging price
Welches Weltethos begrĂŒndet die Menschenrechte?
[Abstract fehlt
Les graffitis latins du Mas Sauvy (Villeneuve-de-la-Raho, Pyrénées Orientales)
Nous prĂ©sentons dans ce travail une sĂ©rie de graffitis latins inĂ©dits mis au jour sur le site du Mas Sauvy, Ă mi-chemin entre les agglomĂ©rations antiques de Ruscino (ChĂąteau-Roussillon, Perpignan) et dâIlliberis (Elne), et qui prĂ©sente des points communs avec les ensembles des Sedes Ă Peyrestortes et du Petit Clos Ă Perpignan. Les graffitis du Mas Sauvy sont datables de ca. 80-120 de notre Ăšre ou lĂ©gĂšrement plus tard ; ils ont Ă©tĂ© gravĂ©s aprĂšs cuisson, la plupart du temps sur des cruches et portent des inscriptions de propriĂ©tĂ©. MalgrĂ© leur caractĂšre gĂ©nĂ©ralement fragmentaire, le graffito le mieux conservĂ© est une inscription parlante, pour laquelle on trouve de nombreux parallĂšles dans la rĂ©gion
Observations sur les techniques de production des doliums prĂ©romains de Ruscino,(Perpignan, PyrĂ©nĂ©es-Orientales) et leur diffusion rĂ©gionale (IIIeâŻs. et dĂ©but du IIe s. av. n. Ú.)
Le recensement des dĂ©couvertes de doliums estampillĂ©s appartenant Ă la fin du deuxiĂšme Ăąge du Fer, en Roussillon, notamment Ă Ruscino (Perpignan, PyrĂ©nĂ©es-Orientales), et diffusĂ©s jusquâĂ Pech-Maho (Sigean, Aude) a soulevĂ© il y a quelques annĂ©es la question de lâexistence dâune production doliaire roussillonnaise. Lâexamen minutieux des nombreuses traces de façonnage conservĂ©es sur les exemplaires des collections de Ruscino permet maintenant de caractĂ©riser les aspects technologiques de cette production. Cette premiĂšre Ă©tude, loin de rĂ©pondre Ă toutes les questions, soulĂšve lâaspect singulier dâune production Ă diffusion micro-rĂ©gionale, et pose la problĂ©matique de lâitinĂ©rance des techniques et des artisans potiers.The inventory of the discoveries of stamped doliums from the end of the second Iron Age, in Roussillon, particularily in Ruscino, and spread up to Pech-Maho (Sigean, Aude) brought up the question a few years ago of the existence of a production of dolium in the Roussillon. The meticulous examination of the numerous preserved shaping tracks on the collection of Ruscino (Perpignan, PyrĂ©nĂ©es-Orientales) now allows to characterize the technological aspects of this production. This first study, far from answering all the questions, brings up the singular aspect of a small-circulation production, and raises the problematic of the roaming of techniques and artisan potters. Dolium, shaping, cords of reinforcement, Ruscino, Pech-Maho, Elne, second Iron Age
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