 a matrix of category boundary/threshold parameters 

theta

model

computes a test characteristic curve (tcc) from input item parameters

 ~kwd1 

 ~kwd2 

Analysis of Differential Item Functioning (DIF) for
dichotomous and polytomous items using an iterative hybrid of
ordinal logistic regression and item response theory (IRT).

Seung W Choi

lordif

Logistic Ordinal Regression Differential Item Functioning using
IRT

tcc function

<dl> <dt>a</dt>
<dd>a vector of slope parameters</dd> <dt>cb</dt>
<dd>a matrix of category boundary/threshold parameters</dd> <dt>theta</dt>
<dd>a grid of theta values</dd> <dt>model</dt>
<dd>IRT model, either "GRM" or "GPCM"</dd></dl>

Arguments

Seung W. Choi &lt;choi.phd@gmail.com&gt;

Author

computes a test characteristic curve (tcc) — tcc

<dl>

 <dt>a</dt>
<dd>a vector of slope parameters</dd>

 <dt>cb</dt>
<dd>a matrix of category boundary/threshold parameters</dd>

 <dt>theta</dt>
<dd>a grid of theta values</dd>

 <dt>model</dt>
<dd>IRT model, either "GRM" or "GPCM"</dd>

</dl>

tcc: computes a test characteristic curve (tcc)

Description

Usage

Value

Arguments

Author

Details

See Also

Examples