Frank Hansen

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We investigate the relative importance of various factors in explaining the volatility skew observed in the prices of stock options traded on the Chicago Board Options Exchange. The skewness of the risk-neutral density implied by individual stock option prices tends to be more negative for stocks that have larger betas, suggesting that market risk is(More)
  • Frank Hansen
  • Proceedings of the National Academy of Sciences…
  • 2008
We extend the concept of Wigner-Yanase-Dyson skew information to something we call "metric adjusted skew information" (of a state with respect to a conserved observable). This "skew information" is intended to be a non-negative quantity bounded by the variance (of an observable in a state) that vanishes for observables commuting with the state. We show that(More)
The plasmid-mediated colistin resistance gene, mcr-1, was detected in an Escherichia coli isolate from a Danish patient with bloodstream infection and in five E. coli isolates from imported chicken meat. One isolate from chicken meat belonged to the epidemic spreading sequence type ST131. In addition to IncI2, an incX4 replicon was found to be linked to(More)
M. P. O’Connor (, A. E. Sieg and B. P. Wallace, Dept of Bioscience and Biotechnology, Drexel Univ., Philadelphia, PA 19104, USA. Present address for BPW: Duke Univ. Center for Marine Conservation, Nicholas School for the Environment and Earth Sciences, 135 Duke University Marine Lab Road, Beaufort, NC 28516, USA. S. J. Kemp, S. J.(More)
AIMS Development of a real-time PCR method for the specific detection of Salmonella Dublin. METHODS AND RESULTS The method was directed towards a Salm. Dublin-specific sequence of the vagC gene on the Salmonella virulence plasmid (pSDV) and towards Salmonella genus-specific sequence of the invA gene, serving as an internal amplification control. The(More)
Out of a series of 207 consecutive fractures of the tibial shaft, 102 were treated conservatively, 64 fractures were treated by AO compression plate osteosynthesis and 41 by internal fixation using Eggers or Lane plates. The choice of method was independent of the extent of soft tissue damage. A follow-up examination of 199 fractures, with a mean(More)
OBJECTIVES The objectives were to study a possible outbreak of carbapenem-resistant Acinetobacter baumannii by comparing three different typing methods (PFGE, MLST and whole-genome SNPs) and to compare the resistance gene profiles of the isolates. METHODS From December 2012 to October 2013, eight carbapenem-resistant A. baumannii were detected at Odense(More)
We formulate a general theory of decision making based on a lattice of observable events, and we exhibit a large class of representations called the general model. Some of the representations are equivalent to the so called standard model in which observable events are modelled by an algebra of measurable subsets of a state space, while others are not(More)