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ID:51987839
大小:5.15 MB
页数:57页
时间:2020-03-27
《空间统计与地学分析 cs-相关性.ppt》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、空间统计与地学分析武汉大学Spatialstatistics&geographicalanalysisMeasurementWhatarethe4levelsofmeasurement?1.NominalorClassificatoryScaleGender,name2.OrdinalorRankingScaleHardnessofrocks,beauty,militaryranks3.IntervalScaleCelsiusorFahrenheit4.RatioScaleKelvintemperature,speed,height,massorweight2M
2、easuresofAssociationSummarizethestrengthofassociationbetweentwovariables.Howstrongistheassociationorrelationshipbetweentwovariables?SomeMeasuresofAssociationcanalsotellonethedirectionoftherelationshipbetweentwovariables.Interpretationofassociation:XcausesY,YcausesXXandYareactivatedby
3、oneormoreothervariablesXandYinfluenceeachotherreciprocally3MeasuresofAssociation:Interval/RatioPearsoncorrelationcoefficient(r)ForcontinuouslinearlyrelatedvariablesCorrelationratio(eta)FornonlineardataorrelatingamaineffecttoacontinuousdependentvariableBiserialOnecontinuousandonedicho
4、tomousvariablewithanunderlyingnormaldistributionPartialcorrelationThreevariables;relatingtwowiththethird’seffecttakenoutMultiplecorrelationThreevariables;relatingonevariablewithtwoothersBivariatelinearregressionPredictingonevariablefromanother’sscores4MeasuresofAssociation:OrdinalGam
5、maBasedonconcordant-discordantpairs;proportionalreductioninerror(PRE)interpretationKendall’staubP-Qbased;adjustmentfortiedranksKendall’staucP-Qbased;adjustmentfortabledimensionsSomers’sdP-Qbased;asymmetricalextensionofgammaSpearman’srhoProductmomentcorrelationforrankeddata5Measuresof
6、Association:NominalPhiChi-squarebasedfor2*2tablesCramer’sVCSbased;adjustmentwhenonetabledimension>2ContingencycoefficientCCSbased;flexibledataanddistributionassumptionsLambdaPREbasedinterpretationGoodman&Kruskal’stauPREbasedwithtablemarginalsemphasisUncertaintycoefficientUsefulformul
7、tidimensionaltablesKappaAgreementmeasure6Map1Map2YesNoYesacNobdForhandcomputationPhiisthesameasPearsoncorrelationfortwodichotomiesinSPSScorrelationoutput,whichusesexactalgorithms.Chi-squarecoefficient(Nominal)7Spearman’srankordercorrelationcoefficientIngeographicproblemswithdatainran
8、kedform,Spea
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