dif.variance

This function calculates the variance of DIF effects, the so called
DIF variance (Longford, Holland &amp; Thayer, 1993).

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

dif.variance function

<dl> <dt>dif</dt>
<dd>Vector of uniform DIF effects</dd> <dt>se.dif</dt>
<dd>Standard error of uniform DIF effects</dd> <dt>items</dt>
<dd>Optional vector of item names</dd></dl>

Arguments

DIF Variance — dif.variance

<dl>

 <dt>dif</dt>
<dd>Vector of uniform DIF effects</dd>

 <dt>se.dif</dt>
<dd>Standard error of uniform DIF effects</dd>

 <dt>items</dt>
<dd>Optional vector of item names</dd>

</dl>

dif.variance: DIF Variance

Description

Usage

Value

Arguments

References

See Also