calculate_posterior

If the tauj is not within the range rello - relhi from the
dynamic EAP, the procedure ignores the score of item j.

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

calculate_posterior function

<dl><dt>scores</dt>
<dd>A vector with PASS/FAIL observations.
Scores are coded numerically as <code>pass = 1</code> and <code>fail = 0</code>.</dd>
<dt>tau</dt>
<dd>A vector containing the item difficulties for the item
scores in <code>scores</code> estimated from the Rasch model in the
preferred metric/scale.</dd>
<dt>qp</dt>
<dd>Numeric vector of equally spaced quadrature points.</dd>
<dt>scale</dt>
<dd>Scale expansion</dd>
<dt>mu</dt>
<dd>Numeric scalar. The mean of the prior.</dd>
<dt>sd</dt>
<dd>Numeric scalar. Standard deviation of the prior.</dd>
<dt>relhi</dt>
<dd>Positive numeric scalar. Upper end of the relevance interval</dd>
<dt>rello</dt>
<dd>Negative numeric scalar. Lower end of the relevance interval</dd></dl>

Arguments

Stef van Buuren, Arjan Huizing, 2020

Author

Calculate posterior of ability — calculate_posterior

<dl>

<dt>scores</dt>
<dd>A vector with PASS/FAIL observations.
Scores are coded numerically as <code>pass = 1</code> and <code>fail = 0</code>.</dd>


<dt>tau</dt>
<dd>A vector containing the item difficulties for the item
scores in <code>scores</code> estimated from the Rasch model in the
preferred metric/scale.</dd>


<dt>qp</dt>
<dd>Numeric vector of equally spaced quadrature points.</dd>


<dt>scale</dt>
<dd>Scale expansion</dd>


<dt>mu</dt>
<dd>Numeric scalar. The mean of the prior.</dd>


<dt>sd</dt>
<dd>Numeric scalar. Standard deviation of the prior.</dd>


<dt>relhi</dt>
<dd>Positive numeric scalar. Upper end of the relevance interval</dd>


<dt>rello</dt>
<dd>Negative numeric scalar. Lower end of the relevance interval</dd>

</dl>

Name	Label
`eap`	Mean of the posterior
`gp`	Vector of quadrature points
`posterior`	Vector with posterior distribution.

calculate_posterior: Calculate posterior of ability

Description

Usage

Value

Arguments

Author