dscore-package: dscore: D-score for Child Development

Description

The dscore package implements several tools needed to calculate the D-score, a numerical score that measures generic development in children.

Arguments

User functions

The available functions are:

Function	Description
`get_itemnames()`	Extract item names from an itemtable
`order_itemnames()`	Order item names
`sort_itemnames()`	Sort item names
`decompose_itemnames()`	Get four components from itemname
<U+00A0>
`get_itemtable()`	Get a subset from the itemtable
`get_labels()`	Get labels for items
`rename_gcdg_gsed()`	Rename gcdg into gsed lexicon
<U+00A0>
`dscore()`	Estimate D-score and DAZ
`dscore_posterior()`	Calculate full posterior of D-score
`get_tau()`	Get difficulty parameters from item bank
<U+00A0>
`daz()`	Transform to age-adjusted standardized D-score
`zad()`	Inverse of `daz()`
`get_reference()`	Get D-score age-reference
`get_age_equivalent()`	Translate difficulty to age

Built-in data

The package contains the following built-in data:

Data	Description
`builtin_itembank()`	A `data.frame` containing the difficulty estimates of items according to final Rasch models.
`builtin_itemtable()`	A `data.frame` containing names and descriptions of items from 22 instruments.
`builtin_references()`	A `data.frame` with LMS reference values used to transform from D-score to DAZ, DAZ to D-score.
`milestones()`	A small demo dataset with PASS/FAIL responses from 27 preterms, measured at various ages between birth
and 2.5 years.

References

Jacobusse, G., S. van Buuren, and P.H. Verkerk. 2006. <U+201C>An Interval Scale for Development of Children Aged 0-2 Years.<U+201D> Statistics in Medicine 25 (13): 2272<U+2013>83. pdf

Van Buuren S (2014). Growth charts of human development. Stat Methods Med Res, 23(4), 346-368. pdf

Weber AM, Rubio-Codina M, Walker SP, van Buuren S, Eekhout I, Grantham-McGregor S, Caridad Araujo M, Chang SM, Fernald LCH, Hamadani JD, Hanlon A, Karam SM, Lozoff B, Ratsifandrihamanana L, Richter L, Black MM (2019). The D-score: a metric for interpreting the early development of infants and toddlers across global settings. BMJ Global Health, BMJ Global Health 4: e001724. pdf.

GSED team (Maureen Black, Kieran Bromley, Vanessa Cavallera (lead author), Jorge Cuartas, Tarun Dua (corresponding author), Iris Eekhout, Gunther Fink, Melissa Gladstone, Katelyn Hepworth, Magdalena Janus, Patricia Kariger, Gillian Lancaster, Dana McCoy, Gareth McCray, Abbie Raikes, Marta Rubio-Codina, Stef van Buuren, Marcus Waldman, Susan Walker and Ann Weber). 2019. <U+201C>The Global Scale for Early Development (GSED).<U+201D> Early Childhood Matters. link