Students’ Self-reported Background SES Measures in TIMSS in Relation to Register SES Measures When Analysing Students’ Achievements in Sweden

The overall aim of this study was to examine the different self-reported students’ socioeconomic status (SES) measures in Trends Mathematics and Science Study (TIMSS) comparison national SES obtained from Swedish official registers. A further determine if same conclusions could be drawn student were used define when modelling TIMSS mathematics achievement. results showed that choice matters. home educational resource index books at data base good indicators SES. We conclude one has access information registers it is recommended use because these have less missing compared with variables.