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基于Edgeworth展开的已实现波动率校正 Introduction Financialmarketsareknownfortheirinherentvolatilityandunpredictability.Oneofthekeyissuesthathasbeenattractingattentionovertheyearsishowtomeasureandpredictmarketvolatility.Inthecontextoffinancialoptions,volatilityistypicallymeasuredusingtheimpliedvolatilityobtainedfromtheoptionprices.However,thismeasureisoftenbiasedandinaccurateduetomarketinefficiencies,liquidityissues,andotherfactors.Therefore,itisessentialtodevelopalternativemethodsformeasuringandcorrectingformarketvolatility. Onesuchmethodistheuseofrealizedvolatility.Realizedvolatilityisameasureofvolatilitythatiscalculatedfromhistoricalassetprices.Thismeasureisoftenconsideredmoreaccuratethanimpliedvolatilitybecauseitisbasedonactualmarketdata.However,realizedvolatilityhaslimitations,suchasitssensitivitytonoiseanditsinabilitytocapturelong-termtrends.Therefore,researchershavedevelopedvarioustechniquestoenhancetheeffectivenessofrealizedvolatility. OneofthesetechniquesistheEdgeworthexpansion.TheEdgeworthexpansionisastatisticalmethodthatemployshighermomentsofthedistributionofunderlyingassetreturnstoimprovetheaccuracyofrealizedvolatility.Thisexpansioninvolvesaseriesofcalculationsthatincorporateadditionalinformationaboutthedistributionofreturns,suchasskewnessandkurtosis.Byincorporatinghighermoments,theEdgeworthexpansionprovidesmoreaccurateestimatesofvolatilityandreducesthebiasassociatedwithstandardrealizedvolatility. ThispaperaimstoexploretheconceptofEdgeworthexpansionforrealizedvolatilitycorrection.ThepaperwillprovideanoverviewofthetheoreticalbackgroundoftheEdgeworthexpansionandhowitcanbeappliedtofinancialmarketdata.Itwillalsodiscusstheadvantagesandlimitationsofthistechniqueandcompareitseffectivenesswithotherapproachestovolatilitycorrection. TheoreticalBackground TheEdgeworthexpansionisastatisticalmethodthatderivesamoreaccurateestimateofthedistributionofunderlyingassetreturnsbyincorporatinghighermoments.Traditionally,thedistributionofreturnshasbeenestimatedusingthefirsttwomoments,namely