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1、3DataVisualizationDataispossiblybestunderstood,whereverplausible,ifitisdisplayedinareasonablemanner.Chen,et.al.(2008)hascompiledarticleswheremanyscientistsofdatavisualizationgiveadeeper,historical,andmoderntrendofdatadisplay.Datavisualizationmayprobablybeashistoricalasdataitse
2、lf.Itemergesacrossallthedimensionsofscience,history,andeverystreamoflifewheredataiscaptured.ThereadermayespeciallygothroughtherichhistoryofdatavisualizationinthearticleofFriendly(2008)fromChen,et.al.(2008).TheaestheticsofvisualizationhasbeenelegantlydescribedinTufte(2001).Thec
3、urrentchapterwillhaveadeepimpactontherestofthebook,andmoreoverthischapteraimstoprovidetheguidanceandspecializedgraphicsintheappropriatecontextintherestofthebook.Thischapterprovidesthenecessarystimulusforunderstandingthegistthatdiscreteandcontinuousdataneedsappropriatetools,and
4、thevalidationmaybeseenthroughthedistinctcharacteristicsofsuchplots.Further,thischapterisalsomorecloselyrelatedtoChapter4,ExploratoryAnalysis,andmanyvisualizationtechniqueshereindeedare"exploratory"innature.Thus,thecurrentchapterandthenextcomplementmutually.Ithasbeenobservedtha
5、tinmanypreliminarycourses/text,alotofemphasisisonthetypeoftheplots,sayhistogram,boxplot,andsoon,whicharemoresuitablefordataarisingforcontinuousvariables.Thus,weneedtomakeadistinctionamongtheplotsfordiscreteandcontinuousvariabledata,andtowardsthiswefirstbeginwithtechniqueswhich
6、givemoreinsightonvisualizationofdiscretevariabledata.InRtherearefourmainframeworksforproducinggraphics:basicgraphs,grids,lattice,andggplot2.Inthecurrentchapter,thefirstthreeareusedmostlyandthereisabriefpeekatggplot2attheend.DataVisualizationThischapterwillmainlycoverthedetails
7、oneffectivedatavisualization:Visualizationofcategoricaldatausingabarchart,dotchart,spineandmosaicplots,andthepiechartanditsvariantsVisualizationofcontinuousdatausingaboxplot,histogram,scatterplotanditsvariants,andtheParetochartAverybriefintroductiontotherichschoolofggplot2Visu
8、alizationtechniquesforcategoricaldataInChapter1,DataCharacter
