56 Date 20120614 Author Christopher Brown Maintainer Christopher Brown Depends utils Description Expands factors characters and other eligible classes into dummyindicator variables URL httpwwwdecisionpatternscom License GPL 2 LazyLoad no Repository ID: 80593
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2dummies-package dummies-packageCreateandmanipulatedummyvariablesexiblyandefciently DescriptionContainsfunctionstocreatedummyvariablesexiblyusingmodel.matrixreturningthemaseithermatricesordataframesforfurtheranalysis.Alsoi,containsmethods,formanipulatingdummyvariables.DetailsPackage:dummiesType:PackageVersion:1.5.6Date:2012-06-14License:GPL�(=2)LazyLoad:noAuthor(s)Author:ChristopherBrownMaintainer:ChristopherBrownReferenceshttp://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:create_indicatorhttp://blog.opendatagroup.com/2009/09/30/r-the-dummies-packageSeeAlsodummyExamples#Seeexamplesinthedocumentationfordummy 4dummyDetailsdummytakeasinglevariableORthenameofsinglevariableandadataframe.Itcoercesthevariabletoafactorandreturnsamatrixofdummyvariablesusingmodel.matrix.Ifthedatahasrownames,theseareretained.Optionally,theparameterdropindicatesthatthatdummyvariableswillbecreatedforonlytheexpressedlevelsoffactors.Settingittofalsewillproducedummyvariablesforalllevelsofallfactors.Ifthereisonlyonelevelforthevariableandverbose==TRUE,awarningisissuedbeforecreatingthedummyvariable.Eachelementofthisdummyvariable,willhavethesamevalue.Aseperator,sep,canbespeciedfortheseperatorbetweenthevariablenameandthevaluefortheconstructionofnewvariablenames.Thedefaultistoprovidenoseperator.Thetypeofvaluesreturnedcanbeaffectedusingthefunargument.funiscalledoneachofthere-sultantdummyvariables.Theonlyusefulfunctionsthattheauthorhasemployedareas.interger(thedefault)oras.logical.dummy.data.frametakesadata.frameormatrixandreturnsadata.frameinwhichallspeciedcolumnsareexpandedasdummyvariables.Speciccolumnscanbenamedwiththenamesargu-mentorspeciedonaclassbasisbythedummy.classesargument.Speciednamestakeprecedentoverclasses.Thedefaultistoexpanddummyvariablesforcharacterandfactorclasses,andcanbecontrolledgloballybyoptions('dummy.classes').IftheargumentallisFALSE.Theresultingdata.framewillcontainonlythenewdummyvariables.Bydefault,allcolumnsoftheobjectarereturnedintheorderoftheoriginalframe.Dummyvariablesareexpandedinplace.omit.constantsindicateswhethertoomitdummyvariablesthatassumeonlyasinglevalue.Thisisthedefault.Ifdrop==FALSE,constantvariablesareretainedregardlessofthesetting.Valuedummyreturnsamatrixwiththenumberofrowsequaltothethatofgivenvariable.Bydefault,thematrixcontainsintegers,buttheexacttypecanbeaffectedbyfunargument.Rownamesareretainedifthesuppliedvariablehasassociaterownames.dummy.data.framereturnsadata.frameinwhichvariablesareexpandedtodummyvariablesiftheyareoneofthedummyclasses.Thecolumnsarereturninthesameorderastheinputwithdummyvariablecolumnsreplacingtheoriginalcolumn.Author(s)ChristopherBrownReferenceshttp://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:create_indicatorhttp://tolstoy.newcastle.edu.au/R/help/00b/1199.htmlhttp://tolstoy.newcastle.edu.au/R/help/03a/6409.htmlhttp://tolstoy.newcastle.edu.au/R/help/01c/0580.htmlManyotherdiscussionsonR-Help.Toomanytolist. 6which.dummyUsageget.dummy(data,name=NULL)ArgumentsdataAdata.framewithandummiesattributesnameOptional.Thenameofavariable.DetailsThisuseswhich.dummytoidentifythedummycolumns.ValueThesubsetofdatathataredummycolumns.Author(s)ChristopherBrownSeeAlsowhich.dummy,dummy.data.frameExamplesdata(iris)ddummy.data.frame(iris)get.dummy(d,'Species') which.dummyIdentifywhichcolumnsaredummyvariablesonadataframe. DescriptionGivenadataframeandanoptionalvariablename,which.dummyidentieswhichcolummnsaredummyvariablesbythecolumnindex.Usagewhich.dummy(data,name=NULL)ArgumentsdataAnobjectwitha'dummies'attributenameOptional.Thenameofacolumnthathasbeenexpandedtoadummyvariable. IndexTopicattributewhich.dummy,6Topicmanipdummy,3get.dummy,5which.dummy,6Topicmodelsdummy,3Topicpackagedummies-package,2dummies(dummies-package),2dummies-package,2dummy,2,3,3,7dummy.data.frame,6,7factor,5get.dummy,5model.frame,5model.matrix,4,5which.dummy,6,68