Chapter 8 Precision

This section shows the properties of the D-score when calculated from short tests. The study of quick tests is useful because it reveals the behaviour of the D-score when the measurement is inherently imprecise.

This section covers:

  • Structure of milestone subsets (8.1)
  • Impact of short tests on D-score (8.2)
  • Impact of short tests on predicting IQ (8.3)