We use various instruments to gather data for our empirical research in the social and behavioural sciences. For example, we use questionnaires and registers to gather quantitative data on a large scale. Cross-cultural comparative studies and longitudinal studies (in which we follow people for a longer period of time) are of increasing importance, as is internet research and the use of register information.

Internet research is becoming increasingly important

The research line Data Collection and Data Quality has six sub-areas:

  1. Internet and Mixed mode surveys
  2. Survey data quality in panel surveys
  3. Register data, including statistical models for population size estimation
  4. Mixed methods research
  5. Missing data analysis
  6. Optimal design (see also the Longitudinal Research research line)