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1、AbstractIntheactualexperimentalstudies,estimatesandevaluatetheroleofsomekindoftreatmenteffect,usingrandomizedcontrolledtrials(randomizedcontrolledtrial,RCT)isundoubtedlythebest.RCTisnotonlythe"goldstandard",andisthebasisfortheactualteststatisticalanalysis，buttheapplicationoftheRCTisalsosubjecttos
2、omerestrictions,suchasthehighcostofresearchandpracticaldifficulties,andethicsfactorsandisnotapplytotheresearchthathavealongcycle.Non-randomizedstudyhavesomelimitations,suchasistheunbalancednatureofthedistributionofprognosticfactorsbetweengroupsandavarietyofbiasexists,willproducebiasedtreatmenteff
3、ectestimates.Statisticalresearchisoftenusedinthemultivariateanalysismodelmatchingmethod,hierarchicalmethodandothermethodstocontrolbias,butmultivariateanalysismodeldoesnotapplytothelowincidenceofoutcome,andconfoundersmanycases;matchingmethodandhierarchicalmethoddoesnotapplytomixedmanyfactors.Prope
4、nsityscoresisanewmethodofnon-randomizedstudytocontrolbias.Inrecentyears,thepropensityscoremethodforitsresearchstephighdegreeofstandardization,easytounderstandandadvantageshaveattractedmuchattentionofresearchers,andwidelyusedinvariousofnon-randomizedstudyfields,.RubinandRosenbaumproposedthepropens
5、ityscoresin1983,itsconceptisgivenasetofcovariatespremise,anyoneofthesubjectsassignedtoatreatmentgrouporcontrolgroupconditionalprobability.Propensityscorecanrepresentmultiplecovariatescombinationoftheresults;itcancontrolthebiasbyadjustingthecovariatebalancebetweenthetreatmentgroupandthecontrolgrou
6、p.Propensityscoremethodismainlyusedinthetwogroupshasnotbeenextendedtothefieldofmulti-packetdata,packetdataapplications,thereareanumberofkeyissuesyettoberesolved,suchasthechoiceofmatchingcalipersvalue,sensitivitytestandbalanceevaluationmethods.Probitmodel,estimatepropensityscoresthroughthegraduali
7、ntroductionofruralhouseholdscharacteristicvariables,checkthecultivationoftobaccousersandnon-tobaccoplantinghouseholdstendtoscorebalancedmodelPseudo-R^2valueoptionstomeetbalancerequirementsPseudo-R^2valuecombinationsofv
