informationWrightMap

myItems

myAbilities

A character String.
Should the test information be calculated empirically ("empirical" - default) or analytically using moments of distribution ("approx").

type

The smallest value of ability PDF to plot.

minTheta

The largest value of ability PDF to plot.

maxTheta

The increment to iterate over the ability PDF. Defaults to 0.01.

stepTheta

A scaling factor to apply to the plot of tesr information.
Because ability distribution is a PDF with area one, and a test information function has area L, this can make the plot more interpretable. Defaults to 1.

scaleInfo

Plots test information function, relative to ability density, and item locations.

Extends 'ACER ConQuest' through a family of functions
designed to improve graphical outputs and help with advanced analysis
(e.g., differential item functioning). Allows R users to call
'ACER ConQuest' from within R and read 'ACER ConQuest' System Files
(generated by the command 'put'). Requires 'ACER ConQuest' version
5.19.5 or later. A demonstration version can be downloaded from
<https://shop.acer.org/acer-conquest-5.html>.

Dan Cloney

conquestr

An R Package to Extend 'ACER ConQuest'

Ray Adams

informationWrightMap function

<dl><dt>myItems</dt>
<dd>A vector of item deltas.</dd>
<dt>myAbilities</dt>
<dd>A vector of person abilities.</dd>
<dt>type</dt>
<dd>A character String.
Should the test information be calculated empirically ("empirical" - default) or analytically using moments of distribution ("approx").</dd>
<dt>minTheta</dt>
<dd>The smallest value of ability PDF to plot.</dd>
<dt>maxTheta</dt>
<dd>The largest value of ability PDF to plot.</dd>
<dt>stepTheta</dt>
<dd>The increment to iterate over the ability PDF. Defaults to 0.01.</dd>
<dt>scaleInfo</dt>
<dd>A scaling factor to apply to the plot of tesr information.
Because ability distribution is a PDF with area one, and a test information function has area L, this can make the plot more interpretable. Defaults to 1.</dd></dl>

Arguments

informationWrightMap — informationWrightMap

<dl>

<dt>myItems</dt>
<dd>A vector of item deltas.</dd>


<dt>myAbilities</dt>
<dd>A vector of person abilities.</dd>


<dt>type</dt>
<dd>A character String.
Should the test information be calculated empirically ("empirical" - default) or analytically using moments of distribution ("approx").</dd>


<dt>minTheta</dt>
<dd>The smallest value of ability PDF to plot.</dd>


<dt>maxTheta</dt>
<dd>The largest value of ability PDF to plot.</dd>


<dt>stepTheta</dt>
<dd>The increment to iterate over the ability PDF. Defaults to 0.01.</dd>


<dt>scaleInfo</dt>
<dd>A scaling factor to apply to the plot of tesr information.
Because ability distribution is a PDF with area one, and a test information function has area L, this can make the plot more interpretable. Defaults to 1.</dd>

</dl>

informationWrightMap: informationWrightMap

Description

Usage

Value

Arguments

Examples