Spatial Statistical Analysis Report

Added on - 20 Sep 2019

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SpatialStatisticalAnalysisIntroductionandreportThepurposeofthisprojectistogiveyousomeexperienceperformingspatialstatisticalanalysesandinterpretingthe results.Youwilldownloaddatainordertoperformtheseanalyses.Thisdocumentprovidesthestepsyouwillneedtofollowinordertocompletetheproject.Theoutcomeofthisprojectisareportina'journal"format.Thismeansthatthereportshouldhaveabrief"Introduction",a"Methods"section,anda"ResultsandDiscussion"section.Inthe"Methods"sectionwe wouldlikeyoutolistthefilesyouusedandtheGIS 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)BackgroundDataChicommshapefile (ChicagoCommunityAreasincludingselectedeconomicdata)TheMapCollection,UniversityofChicagoLibrarysite doesnotdefinethefieldsintheArcViewshapefile.Herearethefield(variable)definitions:SHAPE=polygonCHICOMNO=ChicagoCommunityAreafour-digitnumberDISTNAME=ChicagoCommunityAreanumberDISTITLE=ChicagoCommunityAreanamesFAMINC=familyincome,averageHOUSINC=householdincome,averagePERCAPINC=percapitaincome,average
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
featurelocationsandfeaturevaluessimultaneously.Givenasetoffeaturesandanassociatedattribute,itevaluateswhetherthepatternexpressedisclustered,dispersedorrandom.AMoran'sIndexvaluenear+1.0indicatesclustering;anindexvaluenear-1.0indicatesdispersion.AZScoreis alsocalculatedtoassesswhetherthe observedclustering/dispersionisstatisticallysignificantornot.AnselinLocalMoran'sIAsdescribedintheArcGISHelpfile:Givenasetofweighteddatapoints,theClusterandOutlierAnalysistoolidentifiesthoseclustersof pointswithvaluessimilarinmagnitude,andthoseclustersofpointswithveryheterogeneousvalues.(Forlineandpolygonfeatures,centroidsarecalculatedpriortoanalysis).OutputincludesanIndexvalueandaZScoreforeachfeature.TheZScore representsthestatisticalsignificanceoftheindexvalueforthedistancespecified.
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