plot.Cat

plot,Cat

plot,Cat-method

Function to plot item response functions, item characteristic functions, and item information functions
for Cat objects.

Provides methods of computerized adaptive testing for survey researchers. See Montgomery and Rossiter (2020) <doi:10.1093/jssam/smz027>. Includes functionality for data fit with the classic item response methods including the latent trait model, Birnbaum`s three parameter model, the graded response, and the generalized partial credit model. Additionally, includes several ability parameter estimation and item selection routines. During item selection, all calculations are done in compiled C++ code.

Erin Rossiter

catSurv

Computerized Adaptive Testing for Survey Research

Jacob Montgomery

plot.Cat function

<dl><dt>x</dt>
<dd>Cat object.</dd>
<dt>item</dt>
<dd>Numeric. Item index.</dd>
<dt>plotType</dt>
<dd>Character. Either "IRF", "ICC", or "IIF" for item response functions, item characteristic functions, and item information functions, respectively.</dd>
<dt>xlim</dt>
<dd>Vector. Range of the x-axis.</dd>
<dt>...</dt>
<dd>Other arguments passed to plot().</dd></dl>

Arguments

Plotting function for Cat object — plot.Cat

<dl>

<dt>x</dt>
<dd>Cat object.</dd>


<dt>item</dt>
<dd>Numeric. Item index.</dd>


<dt>plotType</dt>
<dd>Character. Either "IRF", "ICC", or "IIF" for item response functions, item characteristic functions, and item information functions, respectively.</dd>


<dt>xlim</dt>
<dd>Vector. Range of the x-axis.</dd>


<dt>...</dt>
<dd>Other arguments passed to plot().</dd>

</dl>

plot.Cat: Plotting function for Cat object

Description

Usage

Arguments