ABSTRACT
This section deals with the nitty-gritty of the modelling strategy used for the GCDG data introduced in Section 2.2. This section
provides a high-level description of the GCDG data (2.5.1)
discusses various modelling strategies (2.5.2)
shows the impact of equate groups on the model in extreme cases (2.5.3)
demonstrates visualization of age profiles to select promising equate groups (2.5.4)
introduces a helpful visualization of the quality of the equate group (2.5.5)
highlights infit and outfit for removing misfitting milestones (2.5.6)
discusses instrument fit and equate group editing (2.5.7)
introduces a grading system for equate groups (2.5.8)
provides pointers to the final model (2.5.9)
