data.pars1.rasch

data.pars1.2pl

The datasets contain item parameters to be prepared for linking
using the function <code>linking.haberman</code>.

Supplementary functions for item response models aiming
to complement existing R packages. The functionality includes among others
multidimensional compensatory and noncompensatory IRT models
(Reckase, 2009, <doi:10.1007/978-0-387-89976-3>),
MCMC for hierarchical IRT models and testlet models
(Fox, 2010, <doi:10.1007/978-1-4419-0742-4>),
NOHARM (McDonald, 1982, <doi:10.1177/014662168200600402>),
Rasch copula model (Braeken, 2011, <doi:10.1007/s11336-010-9190-4>;
Schroeders, Robitzsch & Schipolowski, 2014, <doi:10.1111/jedm.12054>),
faceted and hierarchical rater models (DeCarlo, Kim & Johnson, 2011,
<doi:10.1111/j.1745-3984.2011.00143.x>),
ordinal IRT model (ISOP; Scheiblechner, 1995, <doi:10.1007/BF02301417>),
DETECT statistic (Stout, Habing, Douglas & Kim, 1996,
<doi:10.1177/014662169602000403>), local structural equation modeling
(LSEM; Hildebrandt, Luedtke, Robitzsch, Sommer & Wilhelm, 2016,
<doi:10.1080/00273171.2016.1142856>).

Alexander Robitzsch

sirt

Supplementary Item Response Theory Models

data.pars1.rasch function

<ul>
<li>The format of <code>data.pars1.rasch</code> is:
<code>'data.frame': 22 obs. of 4 variables:</code> 
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> 
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> 
<code> $ a : num 1 1 1 1 1 1 1 1 1 1 ...</code> 
<code> $ b : num -1.5862 0.40762 1.78031 2.00382 0.00862 ...</code>
Item slopes <code>a</code> are fixed to 1 in 1PL estimation. Item difficulties
are denoted by <code>b</code>. </li>
<li>The format of <code>data.pars1.2pl</code> is:
<code>'data.frame': 22 obs. of 4 variables:</code> 
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> 
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> 
<code> $ a : num 1.238 0.957 1.83 1.927 2.298 ...</code> 
<code> $ b : num -1.16607 0.35844 1.06571 1.17159 0.00792 ...</code> </li>
</ul>

Format

Item Parameters for Three Studies Obtained by 1PL and 2PL Estimation — data.pars1.rasch

<ul>
<li>The format of <code>data.pars1.rasch</code> is:
<code>'data.frame': 22 obs. of 4 variables:</code> 
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> 
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> 
<code> $ a : num 1 1 1 1 1 1 1 1 1 1 ...</code> 
<code> $ b : num -1.5862 0.40762 1.78031 2.00382 0.00862 ...</code>
Item slopes <code>a</code> are fixed to 1 in 1PL estimation. Item difficulties
are denoted by <code>b</code>. </li>
<li>The format of <code>data.pars1.2pl</code> is:
<code>'data.frame': 22 obs. of 4 variables:</code> 
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> 
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> 
<code> $ a : num 1.238 0.957 1.83 1.927 2.298 ...</code> 
<code> $ b : num -1.16607 0.35844 1.06571 1.17159 0.00792 ...</code> </li>
</ul>

data.pars1.rasch: Item Parameters for Three Studies Obtained by 1PL and 2PL Estimation

Description

Usage

Arguments

Format