C. Houdré

  1. Small-time expansions of the distributions, densities, and option prices of stochastic volatility models with L\'evy jumps.

    Authors: C. Houdré, J.E. Figueroa-López, R. Gong
    Subjects: Pricing of Securities
    Abstract

    We consider a stochastic volatility model with L\'evy jumps for a log-return
    process $Z = (Z_t)_{t\ge 0}$ of the form $Z = U+X$, where $U = (U_t)_{t\ge 0}$
    is a classical stochastic volatility process and $X = (X_t)_{t\ge 0}$ is an
    independent L\'evy process with absolutely continuous L\'evy measure $\nu$.
    Small-time expansions, of arbitrary polynomial order in time $t$, are obtained
    for the tails $\bbp(Z_t \ge z)$, $z >0$, and for the call-option prices
    $\bbe(e^{z+Z_t} - 1)_+$, $z\neq 0$, assuming smoothness conditions on the
    L\'evy density away from the origin and a small-time large de

  2. On the Rate of Approximation in Finite-Alphabet Longest Increasing Subsequence Problems.

    Authors: C. Houdré, Z. Talata
    Subjects: Probability
    Abstract

    The rate of convergence of the distribution of the length of the longest
    increasing subsequence, towards the maximum eigenvalue of certain matrix
    ensemble, is investigated. For finite-alphabet uniform and non-uniform iid
    sources, a rate of $\log n /\sqrt{n}$ is obtained. The uniform binary case is
    further explored, and an improved $1/\sqrt{n}$ rate obtained.

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