ICCS 2009 Technical Report - IEA

B.10. Dominican Republic• There were no school-level exclusions.• Explicit stratification was performed by school type (public, private), resulting in twoexplicit strata.• Implicit stratification was applied by urbanization (rural, urban), giving a total of fourimplicit strata.Table B.10: Allocation of student sample and teacher sample in the Dominican RepublicSchool Participation Status—Student Survey and Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementPublic 118 2 116 0 0 0Private 32 2 29 0 0 1Total 150 4 145 0 0 1B.11. England• Special education schools, very small schools (fewer than 10 students in the target grade)and student-referral units were excluded at the school level.• No explicit stratification was performed.• Implicit stratification was applied by GCSE performance (six levels) and school type(comprehensive to 16, comprehensive to 18, independent, other type), giving a total of 24implicit strata.Table B.11.1: Allocation of student sample in EnglandSchool Participation Status—Student SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementNone 160 2 81 24 19 34Total 160 2 81 24 19 34Table B.11.2: Allocation of teacher sample in EnglandSchool Participation Status—Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementNone 160 2 77 23 18 40Total 160 2 77 23 18 40Note: Six schools were regarded as non-participating because the within-school participation rate was below 50%.Appendices293