Realistic models for financial asset prices used in portfolio choice, option pricing or risk management include both a continuous Brownian and a jump components. This paper studies our ability to distinguish one from the other. I find that, surprisingly, it is possible to perfectly disentangle Brownian noise from jumps. This is true even if, unlike the usual Poisson jumps, the jump process exhibits an infinite number of small jumps in any finite time interval, which ought to be harder to distinguish from Brownian noise, itself made up of many small moves.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
9915.
Length: Date of creation: Aug 2003 Date of revision: Handle: RePEc:nbr:nberwo:9915
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Find related papers by JEL classification: G12 - Financial Economics - - General Financial Markets - - - Asset Pricing C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions
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