map_elongate

This function elongates the mapping of raw scores to scale scores. Each element
in 'map_raw' and 'map_scale' is repeated according to the length of the
corresponding 'map_raw' element, resulting in equal-length lists of map_raw'
and 'map_scale' scores.

Interpreting the differences between mean scale scores across various
forms of an assessment can be challenging. This difficulty arises from different
mappings between raw scores and scale scores, complex mathematical relationships,
adjustments based on judgmental procedures, and diverse equating functions applied
to different assessment forms. An alternative method involves running simulations
to explore the effect of incrementing raw scores on mean scale scores. The
'idmact' package provides an implementation of this approach based on the
algorithm detailed in Schiel (1998)
<https://www.act.org/content/dam/act/unsecured/documents/ACT_RR98-01.pdf> which
was developed to help interpret differences between mean scale scores on the
American College Testing (ACT) assessment. The function idmact_subj() within
the package offers a framework for running simulations on subject-level scores.
In contrast, the idmact_comp() function provides a framework for conducting
simulations on composite scores.

Mackson Ncube

idmact

Interpreting Differences Between Mean ACT Scores

map_elongate function

<dl><dt>map_raw</dt>
<dd>A list where each element is a number or a numeric vector
representing a set of raw scores. Each vector in 'map_raw' should have a
corresponding element in 'map_scale'.</dd>
<dt>map_scale</dt>
<dd>A list where each element represents a scale score
corresponding to the raw scores in 'map_raw'. Each element in 'map_scale' is
repeated times the length of the corresponding element in 'map_raw'.</dd></dl>

Arguments

Elongate Mapping of Raw Scores to Scale Scores — map_elongate

<dl>

<dt>map_raw</dt>
<dd>A list where each element is a number or a numeric vector
representing a set of raw scores. Each vector in 'map_raw' should have a
corresponding element in 'map_scale'.</dd>


<dt>map_scale</dt>
<dd>A list where each element represents a scale score
corresponding to the raw scores in 'map_raw'. Each element in 'map_scale' is
repeated times the length of the corresponding element in 'map_raw'.</dd>

</dl>

map_elongate: Elongate Mapping of Raw Scores to Scale Scores

Description

Usage

Value

Arguments

Examples