r语言数据挖掘案例

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1、DataMiningwithR:learningbycasestudiesLuisTorgoLIACC-FEP,UniversityofPortoR.CampoAlegre,823-4150Porto,Portugalemail:ltorgo@liacc.up.pthttp://www.liacc.up.pt/∼ltorgoMay22,2003PrefaceThemaingoalofthisbookistointroducethereadertotheuseofRasatoolforperformingdatamining.Risafreelyd

2、ownloadable1languageandenvironmentforstatisticalcomputingandgraphics.Itscapabilitiesandthelargesetofavailablepackagesmakethistoolanexcellentalternativetotheexisting(andexpensive!)dataminingtools.Oneofthekeyissuesindataminingissize.Atypicaldataminingprobleminvolvesalargedataba

3、sefromwhereoneseekstoextractusefulknowledge.InthisbookwewilluseMySQLasthecoredatabasemanagementsystem.MySQLisalsofreelyavailable2forseveralcomputerplatforms.Thismeansthatyouwillbeabletoperform“serious”dataminingwithouthavingtopayanymoneyatall.Moreover,wehopetoshowyouthatthisc

4、omeswithnocompromiseinthequalityoftheobtainedsolutions.Expensivetoolsdonotnecessarilymeanbettertools!RtogetherwithMySQLformapairveryhardtobeataslongasyouarewillingtospendsometimelearninghowtousethem.Wethinkthatitisworthwhile,andwehopethatyouareconvincedaswellattheendofreading

5、thisbook.Thegoalofthisbookisnottodescribeallfacetsofdataminingprocesses.Manybooksexistthatcoverthisarea.InsteadweproposetointroducethereadertothepowerofRanddataminingbymeansofseveralcasestudies.Obviously,thesecasestudiesdonotrepresentallpossibledataminingproblemsthatonecanfac

6、eintherealworld.Moreover,thesolutionswedescribecannotbetakenascompletesolutions.OurgoalismoretointroducethereadertotheworldofdataminingusingRthroughpraticalexamples.AssuchouranalysisofthecasesstudieshasthegoalofshowingexamplesofknowledgeextractionusingR,insteadofpresentingcom

7、pletereportsofdataminingcasestudies.Theyshouldbetakenasexamplesofpossiblepathsinanydataminingprojectandcanbeusedasthebasisfordeveloppingsolutionsforthereader’sdataminingprojects.Still,wehavetriedtocoveradiversesetofproblemsposingdifferentchallengesintermsofsize,typeofdata,goal

8、sofanalysisandtoolsthatarenecessarytocarryoutthisanalysis.Wedonotass