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Spatial Statistical Analysis Report

   

Added on  2019-09-20

10 Pages4070 Words291 ViewsType: 291
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SpatialStatisticalAnalysisIntroductionandreportThepurposeofthisprojectistogiveyousomeexperienceperformingspatialstatistical analysesandinterpretingthe results. Youwilldownloaddatainordertoperformtheseanalyses.Thisdocumentprovidesthestepsyouwillneedtofollowinordertocompletetheproject. Theoutcomeof thisprojectisareportina'journal"format. Thismeansthatthereportshouldhaveabrief"Introduction",a"Methods"section,anda"ResultsandDiscussion"section. Inthe "Methods"sectionwe wouldlikeyoutolistthefiles youusedandtheGIS methodsyouemployed(e.g.,Moran'sI). WedonotneedafullexplanationofMoran'sI,forinstance,onlyastatementthatyouuseditandanynon-defaultparametersusedfor thatmethod.TheideabehindtheMethodssectionisthatanotherGISpersoncouldreplicatetheworkthatyouhavedoneifgiventhesameoriginalfiles.Inthe "ResultsandDiscussion"section,youwillpresentyourresultsandbrieflydiscussthem.DataChicagoCommunityAreas(CCAs)withpercapitaincome (attached)CityofChicago'sChildhoodleaddata (CVS text -- CCA_Pb_csv.txt)Background DataChicommshapefile (ChicagoCommunityAreasincludingselectedeconomicdata)TheMapCollection,UniversityofChicagoLibrarysite doesnotdefinethefieldsintheArcViewshapefile. Herearethefield(variable)definitions:SHAPE=polygonCHICOMNO=ChicagoCommunityAreafour-digitnumberDISTNAME=ChicagoCommunityAreanumberDISTITLE=ChicagoCommunityAreanames FAMINC=familyincome,averageHOUSINC=householdincome,averagePERCAPINC=percapitaincome,average
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MEDVALOOH=medianvalue,ownerunits(buildingorhousevalue)MEDRENT=mediangrossrentCityofChicago'sChildhoodleaddata(CCA_Pb_csv.txt)Theleaddatafilehasthefollowingfields:CA_No=ChicagoCommunityAreanumberComm_Area=ChicagoCommunityAreanamesNo_It_6yrs=Childisdefinedasagesixoryounger(<84months).Thepopulationofchildreninagivencommunityareaisbaseduponthe 2000census.No_Tested=Thenumberofchildrentestedincludesthetotalnumberofuniquechildrenwithanybloodleadtest(capillaryorvenous)reportedineachgivenyear.perc_Tested=(No_Tested/No_lt_6yrs)*100No_Elevated=Thenumberofchildrenwithanelevatedbloodleadlevel(i.e.leadpoisoned)countsthenumberofchildrenwhosehighestvenousbloodleadlevelwas10microgramsperdeciliterorhigher.perc_Elevated=(No_Elevated/No_Tested)* 100SpatialstatisticsMoran'sIThistoolmeasuresspatialautocorrelation(featuresimilarity)basednotonlyonfeaturelocationsaloneoronattributevaluesalone,butonboth
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featurelocationsandfeaturevaluessimultaneously.Givenasetoffeaturesandanassociatedattribute,itevaluateswhetherthepatternexpressedisclustered,dispersedorrandom. AMoran'sIndexvaluenear+1.0indicatesclustering;anindexvaluenear-1.0indicatesdispersion. AZScoreis alsocalculatedtoassesswhetherthe observedclustering/dispersion isstatisticallysignificantornot.AnselinLocalMoran'sIAsdescribedintheArcGISHelpfile: Givenasetofweighteddatapoints,theClusterand OutlierAnalysistoolidentifiesthoseclustersof pointswithvaluessimilarinmagnitude,andthoseclustersofpointswithveryheterogeneousvalues.(Forlineandpolygonfeatures,centroidsarecalculatedpriortoanalysis). OutputincludesanIndexvalueandaZScoreforeachfeature. TheZScore representsthestatisticalsignificanceoftheindexvalueforthedistancespecified.
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