ParetochartFromWikipedia,thefreeencyclopediaJumptonavigationJumptosearchTypeofchartParetochartOneoftheSevenBasicToolsofQualityPurposeToassessthemostfrequentlyoccurringdefectsbycategory†SimpleexampleofaParetochartusinghypotheticaldatashowingtherelativefrequencyofreasonsforarrivinglateatworkAParetochartisatypeofchartthatcontainsbothbarsandalinegraph,whereindividualvaluesarerepresentedindescendingorderbybars,andthecumulativetotalisrepresentedbytheline.ThechartisnamedfortheParetoprinciple,which,inturn,derivesitsnamefromVilfredoPareto,anotedItalianeconomist.Theleftverticalaxisisthefrequencyofoccurrence,butitcanalternativelyrepresentcostoranotherimportantunitofmeasure.Therightverticalaxisisthecumulativepercentageofthetotalnumberofoccurrences,totalcost,ortotaloftheparticularunitofmeasure.Becausethevaluesareindecreasingorder,thecumulativefunctionisaconcavefunction.Totaketheexamplebelow,inordertolowertheamountoflatearrivalsby78%,itissufficienttosolvethefirstthreeissues.ThepurposeoftheParetochartistohighlightthemostimportantamonga(typicallylarge)setoffactors.Inqualitycontrol,itoftenrepresentsthemostcommonsourcesofdefects,thehighestoccurringtypeofdefect,orthemostfrequentreasonsforcustomercomplaints,andsoon.Wilkinson(2006)devisedanalgorithmforproducingstatisticallybasedacceptancelimits(similartoconfidenceintervals)foreachbarintheParetochart.Thesechartscanbegeneratedbysimplespreadsheetprograms,specializedstatisticalsoftwaretools,andonlinequalitychartsgenerators.TheParetochartisoneofthesevenbasictoolsofqualitycontrol.[1][2]Seealso[edit]ControlchartHistogramCumulativedistributionfunction(CDF)ParetoanalysisParetoprincipleStatisticalprocesscontrol(SPC)References[edit]^NancyR.Tague(2004)."SevenBasicQualityTools".TheQualityToolbox.Milwaukee,Wisconsin:AmericanSocietyforQuality.p. 15.Retrieved2010-02-05.^"WhatisaParetoChart?Analysis&Diagram|ASQ".asq.org.Retrieved2019-05-10.Furtherreading[edit]Hart,K.M.,&Hart,R.F.(1989).Quantitativemethodsforqualityimprovement.Milwaukee,WI:ASQCQualityPre