Data Mining With R.pdf

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

2、amining.Risafreelydownloadable1languageandenvironmentforstatisticalcomputingandgraphics.Itscapabilitiesandthelargesetofavailablepackagesmakethistoolanexcellentalternativetotheexisting(andexpensive!)dataminingtools.Oneofthekeyissuesindataminingissize.Atypica

3、ldataminingprobleminvolvesalargedatabasefromwhereoneseekstoextractusefulknowledge.InthisbookwewilluseMySQLasthecoredatabasemanagementsystem.MySQLisalsofreelyavailable2forseveralcomputerplatforms.Thismeansthatyouwillbeabletoperform“serious”dataminingwithouth

4、avingtopayanymoneyatall.Moreover,wehopetoshowyouthatthiscomeswithnocompromiseinthequalityoftheobtainedsolutions.Expensivetoolsdonotnecessarilymeanbettertools!RtogetherwithMySQLformapairveryhardtobeataslongasyouarewillingtospendsometimelearninghowtousethem.W

5、ethinkthatitisworthwhile,andwehopethatyouareconvincedaswellattheendofreadingthisbook.Thegoalofthisbookisnottodescribeallfacetsofdataminingprocesses.Manybooksexistthatcoverthisarea.InsteadweproposetointroducethereadertothepowerofRanddataminingbymeansofsevera

6、lcasestudies.Obviously,thesecasestudiesdonotrepresentallpossibledataminingproblemsthatonecanfaceintherealworld.Moreover,thesolutionswedescribecannotbetakenascompletesolutions.OurgoalismoretointroducethereadertotheworldofdataminingusingRthroughpraticalexampl

7、es.AssuchouranalysisofthecasesstudieshasthegoalofshowingexamplesofknowledgeextractionusingR,insteadofpresentingcompletereportsofdataminingcasestudies.Theyshouldbetakenasexamplesofpossiblepathsinanydataminingprojectandcanbeusedasthebasisfordeveloppingsolutio

8、nsforthereader’sdataminingprojects.Still,wehavetriedtocoveradiversesetofproblemsposingdifferentchallengesintermsofsize,typeofdata,goalsofanalysisandtoolsthatarenecessarytocarryoutthisanalysis.Wedonotass