Chapter 6 Comparing ability

Once we identified a satisfactory D-score model, we may calculate the D-score for children from different cohorts and compare their values. This section highlights various techniques and issues for comparing D-score distributions between studies. We will address the following topics:

  • Comparing child development across studies (6.1)
  • Precision of the D-score (6.2)
  • Domain coverage (6.3)