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Conditional Density Models for Asset Pricing

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  • Damir Filipovi\'c
  • Lane P. Hughston
  • Andrea Macrina
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    Abstract

    We model the dynamics of asset prices and associated derivatives by consideration of the dynamics of the conditional probability density process for the value of an asset at some specified time in the future. In the case where the price process is driven by Brownian motion, an associated "master equation" for the dynamics of the conditional probability density is derived and expressed in integral form. By a "model" for the conditional density process we mean a solution to the master equation along with the specification of (a) the initial density, and (b) the volatility structure of the density. The volatility structure is assumed at any time and for each value of the argument of the density to be a functional of the history of the density up to that time. In practice one specifies the functional modulo sufficient parametric freedom to allow for the input of additional option data apart from that implicit in the initial density. The scheme is sufficiently flexible to allow for the input of various types of data depending on the nature of the options market and the class of valuation problem being undertaken. Various examples are studied in detail, with exact solutions provided in some cases.

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    File URL: http://arxiv.org/pdf/1010.4384
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    Bibliographic Info

    Paper provided by arXiv.org in its series Papers with number 1010.4384.

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    Date of creation: Oct 2010
    Date of revision: Nov 2011
    Handle: RePEc:arx:papers:1010.4384

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