get_tau

Searches the item bank for matching items, and returns the
difficulty estimates. Matching is done by item name. Comparisons
are done in lower case.

The D-score summarizes the child's performance on a set of
milestones into a single number. The package implements four Rasch model
keys to convert milestone scores into a D-score. It provides tools to
calculate the D-score and its precision from the child's milestone scores,
to convert the D-score into the Development-for-Age Z-score (DAZ)
using age-conditional references, and to map milestone names into a
generic 9-position item naming convention.

Stef van Buuren

dscore

D-Score for Child Development

Iris Eekhout

Arjan Huizing

get_tau function

<dl><dt>items</dt>
<dd>A character vector containing names of items to be
included into the D-score calculation. Milestone scores are coded
numerically as <code>1</code> (pass) and <code>0</code> (fail). By default,
D-score calculation is done on all items found in the data
that have a difficulty parameter under the specified <code>key</code>.</dd>
<dt>key</dt>
<dd>String. Name of the key that bundles the difficulty estimates
pertaining one the same Rasch model. View <code>builtin_keys</code> for an overview
of the available keys.</dd>
<dt>itembank</dt>
<dd>A <code>data.frame</code> with at least two columns
named <code>item</code> and <code>tau</code>. By default, the function uses
<code>dscore::builtin_itembank</code>. If you specify your own <code>itembank</code>,
then you should also provide the relevant <code>transform</code> and <code>qp</code> arguments.</dd>
<dt>verbose</dt>
<dd>Logical. Print settings.</dd></dl>

Arguments

Author

Obtain difficulty parameters from item bank — get_tau

<dl>

<dt>items</dt>
<dd>A character vector containing names of items to be
included into the D-score calculation. Milestone scores are coded
numerically as <code>1</code> (pass) and <code>0</code> (fail). By default,
D-score calculation is done on all items found in the data
that have a difficulty parameter under the specified <code>key</code>.</dd>


<dt>key</dt>
<dd>String. Name of the key that bundles the difficulty estimates
pertaining one the same Rasch model. View <code>builtin_keys</code> for an overview
of the available keys.</dd>


<dt>itembank</dt>
<dd>A <code>data.frame</code> with at least two columns
named <code>item</code> and <code>tau</code>. By default, the function uses
<code>dscore::builtin_itembank</code>. If you specify your own <code>itembank</code>,
then you should also provide the relevant <code>transform</code> and <code>qp</code> arguments.</dd>


<dt>verbose</dt>
<dd>Logical. Print settings.</dd>

</dl>

get_tau: Obtain difficulty parameters from item bank

Description

Usage

Value

Arguments

Author

See Also

Examples