builtin_itembank        Collection of items fitting the Rasch model
builtin_itemtable       Collection of items from instruments measuring
                        early child development
builtin_keys            Available keys for calculating the D-score
builtin_references      Collection of age-conditional reference
                        distributions
builtin_translate       A table to translate between different lexicons
                        (naming schema)
calculate_posterior     Calculate posterior of ability
count_mu                Median D-score from the default references for
                        the given key
count_mu_dutch          Median of Dutch references
count_mu_gcdg           Median of GCDG references
count_mu_phase1         Median of phase1 references
count_mu_preliminary_standards
                        Median of preliminary_standards
daz                     Calculate Development-for-Age Z-score (DAZ)
decompose_itemnames     Decomposes item names into their four
                        components
dscore                  D-score estimation
get_age_equivalent      Get age equivalents of items that have a
                        difficulty estimate
get_itemnames           Extract item names
get_itemtable           Get a subset of items from the itemtable
get_labels              Get labels for items
get_mu                  Median D-score from the base population for a
                        given key
get_reference           Get D-score reference
get_tau                 Obtain difficulty parameters from item bank
gsample                 Sample of 10 children from the GSED Phase 1
                        study
milestones              Outcomes on developmental milestones for
                        preterm-born children
normalize               Normalize distribution
posterior               Calculate posterior for one item given score,
                        difficulty and prior
rename_gcdg_gsed        Rename items from gcdg into gsed lexicon
rename_vector           Rename character vector
sample_hf               Sample of 10 children from GSED HF
sample_lf               Sample of 10 children from gto (LF)
sample_sf               Sample of 10 children from gpa (SF)
sort_itemnames          Sorts item names according to user-specified
                        priority
