Assessing the evidence for the comparability of socioeconomic status between students with and without immigrant background in Norway and Sweden

Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 3 Stratification variables used for Norway and Sweden

Country	Explicit stratification variables	Number explicit strata	Implicit stratification variables
Norway	School level (2)	2	None
Sweden	Funding (2); ISCED level (2); Urbanisation for lower secondary (3)	8	Geographic LAN—for upper secondary (21); Responsible authority—for upper secondary (3); Level of immigrants (3); Income Quartiles—for lower secondary/mixed (4)