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AppendixBCharacteristicsofNationalSamplesB.1AlgeriaFOURTHGRADECoverageandExclusions•coverageis100%•School-levelexclusionsconsistedofverysmallschools(MoS<15),privateschools,andschoolswithmulti-levelclasses•nowithin-schoolexclusionsSampleDesign•noexplicitstratification•implicitstratificationbyregion(48regions),foratotalof48implicitstrata•Sampledoneclassroomperschool•SmallschoolssampledwithequalprobabilitiesB.1.1AllocationofSchoolSampleinAlgeria–FourthGradeTotalParticipatingSchoolsNon-IneligibleExplicitStratumsampledParticipatingSchools1st2ndschoolsSampledSchoolsReplacementReplacementAlgeria1500149001Total1500149001EIGHTHGRADECoverageandExclusions•coverageis100%•School-levelexclusionsconsistedofprivateschools•nowithin-schoolexclusionsTIMSS&PIRLSInTeRnaTIonaLSTudyCenTeR,LynchSchooLofEdu