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1、精品文档,值得拥有CreditValueatRiskCreditvalue-at-risk(VAR)modelsperformthecalculationsneededforevaluatingcapitaladequacyandforidentifyingdesiredportfoliochanges.Credit-VARmodelsestimateboththevaluedistributionofanentirecreditportfolioandthemarginalcontributiontoVAR(
2、MVAR)ofeachexposurewithinthatportfolio.1Riskmanagersusethevaluedistributioninassessingcapitaladequacy.TheyusetheMVARmeasuresinguidingportfoliomanagement.TocomputetimelyestimatesofcreditVAR,onemustMaintainacurrent,comprehensive,accessibledatabaseoncreditexpos
3、uresDevelopatoolforcomputingthefuturevalueofexposuresconditionalontheborrower’srisk-ratingorexpected-default-frequency(EDF),andCreateamethodforestimatingthevolatilityovertimeoftheriskratingorEDFofeachborrowerandthecorrelationcoefficientsamongtheriskratingsor
4、EDFsofborrowers.WeillustratebelowthetypicalframeworkforcalculatingcreditVAR(seeExhibit1).Exhibit1:FlowDiagramforCreditVARModelDrawVAR,MVARResultsRatingsCreditVARDatabaseEngineVariance-RecalculateCovarianceValuesStructureAssemblingtheDatabaseonCreditExposures
5、Toidentifyeffectiveportfolio-managementactions,oneneedsaccurate,timelyestimatesofcreditVARandMVAR.Toobtainsuchestimates,thecredit-VARapplicationneedsreadyaccesstoanup-to-date,comprehensive,credit-exposuredatabase.Thisdatabasewillholdbothborrowerandfacilityin
6、formation.TheborrowerdatawillincludeacreditriskratingoranEDForbothaswellasindicatorsofindustryandlocationcompositionandofrelationshipswithotherborrowers.Theselatteritemsaffecttheestimationofcorrelationcoefficients.Thefacilitydatawilldescribeeachcreditexposur
7、etoeachborrower.ThisinformationwillIdentifythefacilitytypesuchastermloan,revolvingline,billdiscountfacility,financialletterofcredit,forwardexchangecontract,interestrateswap,andsoonDescribepricingincludingthespread,baserate,andfeesProvidedetailonstructuralfea
8、turesincludingthecommittedamount,tenor,amortizationschedule,seniority,collateral,andcovenantsSummarizethefacility’sstatusasindicatedbytheamountoutstanding,anticipatedfutureusage,and,foramarket-r