ICCS 2009 Technical Report - IEA

B.28. New Zealand• Westmount Campus schools (“closed Brethren”), correspondence schools, Maori immersionschools, special education schools, and very small schools (fewer than seven students in thetarget grade) were excluded at the school level.• Explicit stratification was performed by school size (very large schools, all other schools),resulting in two explicit strata.• Implicit stratification was applied by school authority (independent (private) schools,state), by school decile (higher socioeconomic disadvantage, moderate socioeconomicdisadvantage, lower socioeconomic disadvantage) for state schools, and by school type(co-ed, boys, girls), giving a total of 10 implicit strata (non-certainty schools).Table B.28.1: Allocation of student sample in New ZealandSchool Participation Status—Student SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementVery large schools 36 0 26 0 0 10All other schools 139 3 116 3 1 16Total 175 3 142 3 1 26Table B.28.2: Allocation of teacher sample in New ZealandSchool Participation Status—Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementVery large schools 36 0 21 0 0 15All other schools 139 0 90 3 1 45Total 175 0 111 3 1 60Note: Five schools were regarded as non-participating because the within-school participation rate was below 50%.B.29. Norway• Sami schools, special needs schools, and very small schools (fewer than five students in thetarget grade) were excluded at the school level.• Explicit stratification was performed by language (Bokmål, Nynorsk), resulting in twoexplicit strata.• No implicit stratification was applied.• Two classrooms were sampled where possible.Appendices305