D-Score for Child Development
Calculate posterior of ability
Median of Dutch references
Median of GCDG references
Median of phase1 references
Median of preliminary_standards
Median D-score from the default references for the given key
Calculate Development-for-Age Z-score (DAZ)
Decomposes item names into their four components
D-score for child development
D-score estimation
Get age equivalents of items that have a difficulty estimate
Extract item names
Get a subset of items from the itemtable
Get labels for items
Median D-score from the base population for a given key
Get D-score reference
Obtain difficulty parameters from item bank
Normalize distribution
Calculate posterior for one item given score, difficulty and prior
Rename items from gcdg into gsed lexicon
Rename character vector
Sorts item names according to user-specified priority
The D-score summarizes a child's performance on developmental milestones into a single number. Its key feature is its generic nature. The method does not depend on a specific measurement instrument. The statistical method underlying the D-score is described in van Buuren et al. (2025) <doi:10.1177/01650254241294033>. This package implements model keys to convert milestone scores to D-scores; maps instrument-specific item names to a generic 9-position naming convention; computes D-scores and their precision from a child's milestone scores; and converts D-scores to Development-for-Age Z-scores (DAZ) using age-conditional reference standards.
Useful links