itemInfoOverTheta

Calculates item information over a rage of theta given a set of item parameters.
Returns a data frame with item information at a discrete set of values of theta. This is
useful for plotting item information functions.
Note this function is redundant - use testInfoOverTheta and pass a single item as a list.

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` <https://conquestmanual.acer.org/s4-00.html#put>).
Requires 'ACER ConQuest' version 5.40 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

itemInfoOverTheta function

<dl><dt>myItem</dt>
<dd>A matrix of item parameters of the structure used in <code>simplef</code></dd>
<dt>minTheta</dt>
<dd>The smallest value of ability PDF to calculate info and to plot.
Defaults to -6.</dd>
<dt>maxTheta</dt>
<dd>The largest value of ability PDF to calculate info and to plot.
Defaults to 6.</dd>
<dt>stepTheta</dt>
<dd>The increment to iterate over the ability PDF. Defaults to 0.01.</dd></dl>

Arguments

itemInfoOverTheta — itemInfoOverTheta

<dl>

<dt>myItem</dt>
<dd>A matrix of item parameters of the structure used in <code>simplef</code></dd>


<dt>minTheta</dt>
<dd>The smallest value of ability PDF to calculate info and to plot.
Defaults to -6.</dd>


<dt>maxTheta</dt>
<dd>The largest value of ability PDF to calculate info and to plot.
Defaults to 6.</dd>


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

</dl>

itemInfoOverTheta: itemInfoOverTheta

Description

Usage

Arguments

Examples