ICCS 2009 Technical Report - IEA

Table B.3: Allocation of student sample and teacher sample in BulgariaSchool Participation Status—Student Survey and Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementRegion 01 12 1 11 0 0 0Region 02 24 2 21 1 0 0Region 03 21 3 18 0 0 0Region 04 23 0 23 0 0 0Region 05 17 4 13 0 0 0Region 06 13 0 13 0 0 0Region 07 10 2 8 0 0 0Region 08 10 1 9 0 0 0Region 09 21 2 19 0 0 0Region 10 11 1 10 0 0 0Region 11 13 1 12 0 0 0Total 175 17 157 1 0 0B.4. Chile• Special educational needs schools, schools on Easter Island (Rapa Nui) and Juan-Fernández-Islands, and schools that were difficult to access were excluded at the schoollevel.• Explicit stratification was performed by school administration (municipal, private,subsidized), resulting in three explicit strata.• Implicit stratification was applied by urbanization (rural, urban), geographical area (north,central, south), and type of education (only primary and lower secondary, primary andsecondary), giving a total of 34 implicit strata.• Over-sampling of private schools. The disproportional allocation was taken into accountwhen sampling weights were computed.Table B.4: Allocation of student sample and teacher sample in ChileSchool Participation Status— Student Survey and Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementMunicipal 85 1 82 1 0 1Private 30 0 28 1 1 0Subsidized 65 1 64 0 0 0Total 180 2 174 2 1 1288 ICCS 2009 technical report