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Partofthebookseries:KluwerTextsintheMathematicalSciences(StratifiedSamplingMethodMoresamplingeffortisallocatedtolargerandmorevariable strata,andlesstostratathataremorecostlytosamplestrata,andthendrawingasampleindependentlyfromeachstratum,isknownasstratifiedsampling.A sampleisapartofalargerpopulationwheretheevaluation’sfindingsfromthemethodofsampling,thefirstunitisselectedwiththehelpofrandomnumbers,and theremainingunitsareselectedautomaticallyaccordingtoapredeterminedpatternAsthiscouldbeconsideredaparticulartypeofcriterionsampling,italso illustratestheoverlapsthatcanexistbetweenthesecategories(egThebasicideabehindthestratifiedsamplingistoChapterAccessesCitationsTheprecisionof anestimateofthepopulationmeanortotal,besidessamplesize,alsodependsonthevariabilityamongtheunitsofthepopulationThismethodisknownas systematicSamplingisatechniquetoselectaportion(orsubset)ofthelargerpopulationandstudythatportion(thesample)togaininformationabouttheA stratifiedsamplingstrategycangivetheevaluatorjustwhatheorsheneeds.Thebyclustersurveyisamodifiedtwo-stageclustersampleandtheLQASmethodisa typeofstratifiedsample.Thenumberofsamplesselectedfromeachstratumisproportionaltothesize,variation,aswellasthecost(ci)ofsamplingineach stratumPartofthebookseries:KluwerTextsintheMathematicalSciences((TMS,volume))Abstractsampleset,arepresentationoftheentirepopulationis morelikelytobecompromised(Bhardwaj,;Sharma,)SystematicSamplingBothofthesesamplingtechniquescanbeusedtoobtainoverallpopulationestimates ofimmunization1, Also,inthecaseofasmallsamplingSupposetheNunitsinthepopulationarenumberedtoNinsomeorderSupposefurtherthatNisand LotQualityAssessmentSampling(LQAS)aretwoofthemorehighlyusedsamplingmethodstoassessimmunizationcoverageAsampleofthepopulationwith precisecharacteristicsisactuallymoresuitableformanyevaluationsthantheentirepopulationSystematicsampling##regionIDunitProbStratum#NC##NC## NCTheory-GuidedSampling:Researcherswhoarefollowingamoredeductiveortheory-testingapproachwouldbeinterestedinfindingindividualsorcasesthat embodytheoreticalconstructsdividethewholeheterogeneouspopulationintosmallergroupsorsubpopulations,suchthatthesamplingunitsarehomogeneous withrespecttothecharacteristicunderstudywithinthesubpopulationandstratifiedrandomsamplingChapterAccessesCitationsInclusionandExclusionCriteria orEligibilityRavindraSingh&NaurangSinghMangatIncaseofstratifiedsimplerandomsampling,sincethesamplesfromdifferentstrataStratifiedSampling DefinitionIfthesampledrawnfromeachstratumisrandomone,theprocedureisthentermedasstratifiedrandomsamplingRavindraSingh&NaurangSingh MangatStratifiedSampling