ICCS 2009 Technical Report - IEA

B.33. Slovak Republic• Schools in which the language of instruction was not Slovak were not covered by ICCS2009.• Very small schools (fewer than five students in the target grade) were excluded at theschool level.• Explicit stratification was performed by region, resulting in eight explicit strata.• Implicit stratification was applied by urbanization (rural, urban), school type (second levelof basic school, second level of eight-years gymnasium—secondary school), giving a totalof 24 implicit strata.Table B.33.1: Allocation of student sample in the Slovak RepublicSchool Participation Status— Student SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementBratislava region 14 0 12 1 0 1Trnava region 12 0 11 0 0 1Trenčín region 17 0 15 1 0 1Nitra region 15 0 13 1 1 0Žilina region 22 0 19 3 0 0Banská Bystrica region 16 0 15 1 0 0Prešov region 26 1 21 3 1 0Košice region 20 0 18 2 0 0Total 142 1 124 12 2 3Table B.33.2: Allocation of teacher sample in the Slovak RepublicSchool Participation Status—Teacher SurveyParticipating SchoolsExplicit Strata Total IneligibleNon-ParticipatingSampled Schools Schools Sampled First Second Schoolsreplacement replacementBratislava region 14 0 13 1 0 0Trnava region 12 0 11 0 0 1Trenčín region 17 0 15 1 0 1Nitra region 15 0 13 1 1 0Žilina region 22 0 19 3 0 0Banská Bystrica region 16 0 15 1 0 0Prešov region 26 1 21 3 1 0Košice region 20 0 18 2 0 0Total 142 1 125 12 2 2Appendices309