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[Typetext][Typetext][Typetext]2014TradeScienceInc.
ISSN:0974-7435Volume10Issue20BioTechnologyAnIndianJournalFULLPAPERBTAIJ,10(20),2014[12660-12666]AcomparativestudyoncarevaluationforecastbasedondataminingYuqingYuan1*,LijunLing2,XianglingKuang1,QinggangZuo31SchoolofEconomicsandManagement,HubeiUniversityofAutomotiveTechnology,ShiYan,442002,(CHINA)2InstituteofScienceandTechnology,HubeiUniversityofAutomotiveTechnology,ShiYan,442002,(CHINA)3DepartmentofScienceandTechnology,ShiyanCentralSub-branchofthePeople'sBankofChinaShiya,People'sRepublicofChina,ShiYan,442002,(CHINA)E-mail:yyq115805@163.
comABSTRACTLogisticregression(LR),artificialneuralnetwork(ANN),decisiontrees(DT),andsupportvectormachine(SVM)wereusedinforecastingcaracceptability,andtheiraccuracy,sensitivityandspecificitywerecompared.
Theresultsshowthatsupportvectormachine(SVM)modelcanwellpredictthecaracceptabilityevaluationwith99.
62percentofaccuracyrateand100percentofsensitivityandspecificity.
Thefactorofsecurityhasthemostinfluenceoncaracceptabilityevaluation.
Comparativestudymethodissuitablefortheevaluationofcaracceptabilityforecasting,canalsobeextendedtoallotherareas.
KEYWORDSDatamining;Caracceptability;Logisticregression;Supportvectormachine;Artificialneuralnetworks;Decisiontree.
BTAIJ,10(20)2014YuqingYuanetal.
12661INTRODUCTIONTheautomotiveindustryisthepillarindustryofthenationaleconomy,andmillionsofpeoplearecloselyrelatedtoit.
Formostpeople,buyingacaristobuyahouseoutsideinadditiontoamaximumconsumption,canbetterreflectconsumerdemandandtherealmarketbehaviour.
Whenconsumersconsiderwhenbuyingacar,therearemanyfactorsthatcouldrestricttheirchoice,suchasprice,carperformance,thecar'scomfortandsafety,etc.
Thesefactorsformtherightcarevaluation.
Thefiercemarketcompetitionforcedautocompaniesinaveryshortdevelopmentcycleofcontinuousimprovementandinnovationinproductdesigntomeettheneedsofhighlydiversetargetmarket[4-6].
Therefore,areasonableevaluationmethodisequallyimportantforcarconsumersandproducers.
Itcannotonlyreducetheburdenondealers,butalsoincreasesales.
Inaddition,itplaysastrategicrole,canimprovecustomerservicelevelsinahighlycompetitivemarketenvironment[1-3]ByunproposedextensionofAHPselectvehiclepurchasepatterns.
Laiandsomehaveproposedamethodtohelpdesignersimprovethequalityfeelofautomotiveproducts.
AlnoukariandAlhussanproposedusingdataminingtechniquestopredictthefutureoftheautomotivemarketdemand.
Chenandsomepeoplemakeuseofartificialintelligencemethods;thepracticalproblemsfacedbytheautopartsindustryinproductperformanceobjectivelyclassify[19-21].
Dataminingtechniquesfromthehiddendatafoundusefulinformationtofacilitatesmartsummaryandfuturedecisions,soithasgreatvisibilityinareasofresearchandcommercialareas,invariousapplications,includingmanufacturing,marketing,finance,healthcareandotherfieldshaveoutstandingperformance,isadataconversionindispensabletoolforinformation.
Advantagesofdataminingtechnologyisitsabilitytohandlemassivetrafficdatainordertoadapttomarketchanges,canprovidedecisionmakerswithapowerfultool.
Itiswidelyusedinbusinessmanagement,governmentadministration,scientificandengineeringdatamanagementoflargeamountsofdataprocessing.
Withtheexplosivegrowthofdata,dataminingtechniquesandtoolshavebecomeanurgentneed,itwillbeprocesseddataintelligentlyandautomaticallyconvertedintousefulinformationandknowledge.
Itimprovestheircompetitiveadvantageandincreasesthecompany'srevenue,butalsoenablesenterprisestoprovidebetterservicetoretaincustomers.
Inthepastfewyears,theclassicdataminingtechnologysuchaslogisticregression(LR),artificialneuralnetworks(ANN),decisiontrees(DT)andSupportVectorMachine(SVM)havebeensuccessfullyappliedinmanyfieldstosolvepracticalproblemsofproduction,salesandresearchinemerging.
[18]However,nocomparativestudytoassessaproduct'sacceptabilityforprediction.
Accurateassessmentofthedevelopmentofproductacceptabilityhasbecomeanimportantresearchtopic.
Thepurposeofthisstudyistoprovideamethodforcomparativeevaluationofthestudytoassessthepredictiveevaluationoftheautomotive,andthenextendedtootherfields.
Bymodellingrespectivelyusinglogisticregression(LR),artificialneuralnetwork(ANN),decisiontrees(DT),supportvectormachine(SVM)thesetechnologyforecastingautomotive,andtheiraccuracy,sensitivityandspecificitywerecompared.
Theresultsshowthatsupportvectormachine(SVM)technologyhasmadethebestassessmentandprediction.
LargelyduetotheperformanceofSVMdependsonthechoiceofkernelfunction,thepaperfinallylinearkernel,polynomialkernel,radialbasis(RBF)kernelandtheS-shapedcorekernelcomparativestudy,polynomialkernelhasachievedthebestresults.
THEBASICCONCEPTANDRESEARCHFRAMEWORKLogisticregressionLogisticregressionisapopularnon-linearstatisticalmodel,andiswidelyusedinmanyfields.
Comparedwiththemultipleregressionmodels,Logisticregressionmodelcansimulatetwoormoredependentvariables.
Forbinaryvariablescanbedefinedasaneventofinterestcodingandcodingarenotinterestedintheeventof0[7-11]Alogisticregressionmodelcanbewrittenas:1122(1)log()1(1)kkpYXXXpYEquationcanbemodifiedasfollows:1(1)1zpYeWhere1122kkzXXXThelogisticregressionmodelenablesustocalculatetheprobabilityofeventY=1occurringforeachcase.
Thepredictors,Xkcanbeamixtureofcontinuousandcategoricalvariables.
12662AcomparativestudyoncarevaluationforecastbasedondataminingBTAIJ,10(20)2014DecisiontreeAdecisiontreeisapredictivemodel;Itrepresentsamappingbetweenobjectattributesandobjectvalues.
Eachnodeinthetreerepresentsanobject,andapossibleattributevaluesforeachforkedpathsarerepresented,eachleafnodecorrespondstothevalueofthepathfromtherootnodetotheleafnodeexperiencedrepresentedobject.
Treeonlyasingleoutput,ifitwanttohaveapluralityofoutput,itcanestablishanindependentdecisiontreetohandledifferentoutput.
DataMiningDecisionTreeisatechniqueoftenused,canbeusedtoanalyzethedata,alsocanbeusedtomakepredictions[12-13].
CommontreealgorithmCHAID(Chi-squaredAutomaticcross-checking),CART(ClassificationandRegressionTrees)andC5.
0.
CARTalgorithmusestheGiniasastandarddecisiontreesplit,C5.
0entropyasthesplitcriteria,CHAIDusingchi-squaretestassegmentationcriteria.
Throughthesealgorithmwillgeneratingtreediagram,,splittingruleandimportantinformationcanbereflectedfromtheFigureout.
ArtificialneuralnetworksArtificialneuralnetworkisanapplicationsimilartothestructureofthebrain-Fimathematicalmodelofinformationprocessing,constitutedbyalargenumberofinterconnectednodes(orneurons)between.
Eachnoderepresentsaspecificoutputfunction,calledactivationfunction.
Eachconnectionbetweentwonodesrepresentsaweightedvalueoftheconnectionforthesignal,referredtotheweight,itisequivalenttothememoryofartificialneuralnetworks.
Theoutputofthenetworkaccordingtothedifferentnetworkconnections,weightsandexcitationfunctionsanddifferent.
MultilayerPerception(MLP)isthemostwidelyusedneuralnetworkmodelinthedataanalysis,itwillentermultipledatasetsaremappedtoasingleoutputdataset.
Artificialneuralnetworkcanidentifyandstudythepatternofassociationbetweeninputdatasetandthecorrespondingtargetvalue[14-15].
However,artificialneuralnetworks(ANNs)forits"blackbox"approachandinterpretationdifficultiessuffercriticism.
Nevertheless,comparedwithothercomparativeclassificationtechniques,artificialneuralnetworktoprovidealternativemodels.
Aftertraining,theartificialneuralnetworkcanbeusedtopredictindependentinputdataofthenew.
SupportvectormachineSupportvectormachine(SVM)isasupervisedlearningmethodcanbewidelyusedinstatisticalclassificationandregressionanalysis.
Supportvectormachineisaclassclassifierwithdifferentkindofsamplescanbeseparatedinthesamplespacehyperplane.
Thatisagivennumberofmarkedwelltrainingsamples.
SVMalgorithmoutputsanoptimizedseparatinghyperplane.
TheessenceofSVMalgorithmistofindacanbeavaluemaximizinghyperplane,thisvalueistheminimumdistancehyperplanedistanceofallthetrainingsamples.
Theminimumdistanceiscalledinterval(margin)[16-17].
Thefollowingequationdefinesahyperplaneexpression:0()TfxxWhichiscalledtheweightvector0calledbias.
Whereinxrepresentsfromthosepointsclosesthyperplane,thesepointsarecalledsupportvectors.
ThekeytoSVMisthekernelfunction.
Vectorsetoflow-dimensionalspaceisoftendifficultdivision,sothesolutionistomapthemtothehigh-dimensionalspace.
Butthedifficultyofthisapproachistobringthecomputationalcomplexityincreases,whilekerneljustingenioussolvethisproblem[15].
Inotherword,aslongastheselectionofappropriatekernelfunction,youcangetahigh-dimensionalspaceclassificationfunction.
InSVMtheory,usingdifferentkernelfunctionwillleadtoadifferentSVMalgorithmtogetadifferentoutput.
ResearchframeworkComparativestudiesofdifferentalgorithmstoassesspredictivecapabilities,thisstudyprovideaverygoodsolutiontothispracticalproblemcaracceptabilityevaluation.
ResearchframeworkshowninFigure1,eachstageoftheprocessisasfollows:Figure1:ResearchFrameworkBTAIJ,10(20)2014YuqingYuanetal.
12663Collectionandinputrawdata:Itcomprisesacollectionoftheoriginaldataandselectsacaracceptabilityevaluationcharacteristicparameter.
Datapre-processing:First,thedatausedtocalculatethenominaldataformat.
Secondly,thecarassesstheacceptabilityofthedatasetisdividedintofourcategories(unacceptable,acceptable,goodandverygood),inthepresentstudy,inordertosimplifythecomplexityoftheacceptabilityoftheresearchintotwocategories,acceptableandunacceptable,thegoodkindofthesamenatureandverygoodclassmergingtoacceptableclass.
ModellingResearch:Studiesusinglogisticregression(LR),artificialneuralnetwork(ANN)anddecisiontree(DT),supportvectormachine(SVM)offourkindsofalgorithmtocalculatetheevaluationofforecastingaccuracyrate,sensitivityandspecificity.
Accuracy,sensitivityandspecificityofthetestmethodisasfollows:Process1collectionandinputrawdataset:Itincludesthecollectionofrawdata,selectingthedataandfocusingonthefeaturesinfluencethecarevaluation.
Process2pre-processingthedataset:Thisstepincludesthreeparts.
Firstly,thedataaretransferredtoforms"nominaltonumeric"forcalculating.
Secondly,therearefourclasses(unacceptable,acceptable,good,andvery-good)incarevaluationdataset.
Inthisstudy,wecombinedthesimilarclasses(acceptable,goodandvery-good)intooneclass.
Thefourclasseswerecombinedtoformtwoclasses(unacceptable,acceptable).
Process3modellingtraining:Studiesusinglogisticregression(LR),artificialneuralnetwork(ANN),decisiontree(DT)andsupportvectormachine(SVM)intotalfourkindsofalgorithmtocalculatetheevaluationofforecastingaccuracyrate,sensitivityandspecificity.
Accuracy,sensitivityandspecificityofthetestmethodisasfollows:TPTNAccuracyTPTNFPFNTPSensitivityTPFNTNSpecificityTNFPIfaninstanceoftheclassispositiveandalsopredictedpositiveclass,thatisthetruepositive,iftheinstanceoftheclassispredictednegativepositiveclass,calledfalsepositive.
Accordingly,iftheinstanceisnegativeclassispredictedtobecomethenegativeclass,calledtruenegative,thepositiveclassispredictedtobecomethenegativeclassisfalsenegative.
THEEMPIRICALRESEARCHDatadescriptionInthiswork,areal-worldcarevaluationdatabasewastakenfromtheUCIrepositoryofmachinelearningdatabaseasdescribedinTABLE1.
Itcontains1728instancesandclassifiedintofourclasses,thereisnomissingvalueinthedataset.
Thecarevaluationdatabasecontainssixattributesexampleswithacar(Buying,Main,Doors,Persons,LugbootandSafety)TABLE1:CarattributeDescriptionClementinemodellingThepentagon-shapednodesshowtheconstructionofthemodelsusinglogisticregression,decisiontrees(CART)andneuralnetwork.
Thediamond-shapednodesshowthemodeloutputsoftherespectivemodels.
Forthelogisticregressionmodel,fourselectionmethods(ENTER,STEPWISE,FORWARDS,BACKWARDS)werecomparedusingtheAnalysisandEvaluationnodes.
Whilefordecisiontress,theC5.
0,CHAIDandCARTmodelsweregeneratedandcompared.
Then,thethreepredictivemodelswhicharestepwiselogisticregression,CARTandneuralnetworkareconnectedtothe"analysis"nodewhichprovidesthecomputationofaccuracyrates,whiletheevaluationnodeproducestheliftcharts.
12664AcomparativestudyoncarevaluationforecastbasedondataminingBTAIJ,10(20)2014Figure2:DataminingprocessflowdiagramComparisonofresultsThedifferentmodellingalgorithmresultsasshownintheTABLE2:TABLE2:ComparisonofmodellingresultsFourdifferentlogisticregressionmethodshavethesameaccuracy,sensitivityandspecificity.
Italsoshowsthatthelogisticregressionmodeltoassessthecaracceptabilityisnotsignificant.
Decisiontreeisthemosteasilyunderstoodmodel,andcanbeeasilyconvertedintoasetofrules.
Inaddition,decisiontreealgorithmcanhandlebothdiscreteandcontinuousdata,withouttheneedfordatatomakeaprioriassumptions.
Becauseoftheseadvantages,themethodofdecisiontreeiswidelyusedforclassificationandprediction.
Thetableshowsthedifferencebetweenthreekindsofdecisiontreemodelaccuracy,sensitivityandspecificity.
Sensitivityconsideredtruepositiverate,referstotheactualacceptabilityoftheprobabilityisdeterminedtobeaccepted.
Andspecificityisconsideredthetruepositiverate,referstotheactualacceptabilityofnottoaccepttheprobabilityisdeterminedunacceptable.
Theresultsofthreedecisiontreealgorithmsareveryclose,butCARTmodelhasthebesttestingandprediction.
Artificialneuralnetworkscanbeusedtopredictcomplexsystemsisdeterminedbytherelationshipbetweenthenumberoftrainingsamples,thetrainingsamplesandthetestsamples,meanwhile,theforecastperformancealsodependsonthechoiceofdatastructures,dataqualityandvariables.
Inthepresentstudy,artificialneuralnetworkachievedgoodperformance,secondonlytoSVM.
Inallthesemodels,SVMhasbetterpredictiveability,whichshowedthebestaccuracy,sensitivityandspecificity.
TheSVMpredictionresultsaredirectlyrelatedtothechoiceofkernel,SecondarymodellingfourdifferentkernelfunctionsofSVMshowninFigure3,experimentalresultsshowthatthepolynomialkernelfunctionhasthebestpredictiveability.
Figure3:SVMkernelfunctionmodelingflowInsummary,thisstudySVMpolynomialkernelfunctiontopredictthecaracceptability,withaverygoodperformance,trainingandtestsetsofaccuracywere99.
92%,99.
62%,sensitivityis100%,specificityof99.
88%and100%asshowninTABLE2.
BTAIJ,10(20)2014YuqingYuanetal.
12665TABLE3:PerformanceofthedifferentkernelsTheimportanceofthevariablesanalyzed,fourmodelresultswerealmostidentical,carsecurityparametersareconsideredthemostsignificantimpactontheacceptabilityofthecarthemost,followedbythecarcanaccommodatethenumber.
Thetwoparameteronconsumeracceptabilityoftheeffectsarelesssignificantisthenumberandsizeofthetrunkdoor.
TABLE4:ComparisonoftheimportanceofautovariablesConclusionFourmodelsusedintheempiricalcaracceptabilityevaluationwerecomparedandresearched,theresultsshowedthatallfourmodelshavesimilargoodpredictiveability,andsupportvectormachinemodel(polynomialkernel)showedthebestaccuracy,sensitivityandspecificity,withthebestpredictiveability,canbeverygoodforcaracceptabilityevaluation.
Inthesixattributesofthecar,thesafetyhasthelargestinfluenceoncaracceptabilityfollowedbyoccupancy,however,consumersislesssensitivetothesetwofactorsofthesizeofthetrunkandthenumberofdoor.
Thiscanhelpcompaniesmakebetterpolicy,targeted,improvedmethodstoimprovethecar'sacceptabilityandconsumersatisfaction.
Summinguptheappeal,theuseofdataminingmodellingmethodcanaccuratelypredicttheacceptabilityofthecarinordertobuildagoodbridgebetweenconsumersandbusinesses,fortheenterpriseprofitsandconsumers'satisfaction.
CONCLUSIONSAcceptanceoftheproductofgrowingconcern,themanufacturermustknowwhichfactorsinfluenceconsumers'buyingdecisions.
Inrecentyears,theproducthasbeenin-depthevaluationoftheacceptabilityofresearch,unfortunately,manufacturersoftenmisunderstandtherealneedsofconsumers,andhowtobetterevaluatetheacceptabilityoftheproductisthekeyissueofproductdevelopment.
Inthisthesis,fortheevaluationofvehicleslinesempiricalresearch,usingfourmodelsfortheevaluationofautomotiveforecastingacomparativestudy,theexperimentalresultsshowthat,usingpolynomialkernelSVMmodelcanbestbeassessedoncarevaluationprediction.
Intheevaluationofthecar,thesafetyperformanceofthemostsignificantfactors,occupancysecond,butcustomerhavenospecialrequirementsofthesizeandthenumberofdoor.
Allinall,acomparativestudydifferentfourmodelsbadeondataminingtoevaluatecaracceptability,resultsshowed,SVMmodelcanbettersolvethecarevaluation,inturn,andthemethodcanbeextendedtootherindustriestosolvetheevaluationoftheproduct.
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