mirt-package

Forum to ask questions relating to the mirt and mirtCAT packages in R, as well as discuss IRT analysis more generally. Bug reports or feature requests should be reported on the respective development versions of the packages on Github (mirt-issues, mirtCAT-issues), and evaluated help files can be found on the associated wiki pages (mirt wiki, mirtCAT wiki). 

Showing 1-36 of 1165 topics
Timer along with questions Manish Kumar 7/14/20
select significant residuals only Tina Zorgt 7/2/20
Error in `[.data.frame`(data.dca, , 1:nfact) : undefined columns selected when `mirt(itemtype='ggum')` Stan Silver 6/17/20
mirt codes Afshin 6/17/20
Testlet model Afshin 6/4/20
Significant S_X2 item fit irukeru 5/26/20
some fixed effects are missing heidi Tang 5/18/20
Problem with using simdata with graded response model Varun Aggarwal 5/11/20
Using DIF in MIRT Jaime Leth-Steensen élève 5/8/20
exploratory multidimensional grm results reporting mahmoud hamza 2/17/20
S-X2 statistic produced NaN for dichotomous items Fulya barış 2/9/20
Possible bug while estimating X2*/X2*_df statistics in itemfit() for multidimensional model results Giuseppe Carteny 2/6/20
angle between items and different dimensions Balal Ezanloo 2/1/20
full mirt equating somayeh Bahmanabadi 9/16/19
mixing items with different format Asghar Minaei 8/19/19
Multidimensional model - only one item for some of the dimensions? ykl7 7/25/19
A few questions about DIF, negative LRT statistics Erin717 10/11/20
bifactor factor scores Sebastian Marin 10/10/20
mirtCAT Test Won't Stop Tom Ron 10/7/20
Data screen by "faoutlier" package b.ez...@gmail.com 10/6/20
Modifying Conditional Probability in E-step Trevor Smith 10/6/20
vcov-method From mirt v1.32.1 to extract Parameter Variance Covariance Matrix Monika Vaheoja 10/2/20
Unable to include an Image in mirtCAT Atmajitsinh Gohil 9/30/20
Slope parameters and model simulation B Morgan 9/30/20
Missing data Multiple Imputation and DIF Shoeayb Qasemi 9/29/20
Weighting Items for Calculating Theta Trevor Smith 9/25/20
How to split age for DIF? Guido 9/25/20
Can't extract FIT statistics CFA mirt? Guido 9/24/20
Difference in results when the MirtCat is hosted online on a server dhruv...@gmail.com 9/24/20
ML person parameters with fscores seem to be slightly off in a GRM philipp...@googlemail.com 9/15/20
item weight Lucas Sempe 9/14/20
longitudinal IRT in mirt() to utilize using MHRM: Error in draw Philip Griffiths 9/4/20
Confusing model fit statistics? Emma Cernis 9/3/20
Longitudinal IRT - non-positive definite matrix Claire Chen 9/3/20
polytomous item example for multipleGroup() function Greta Kurpicz 9/3/20
RMSD index for non-invariance Erin717 9/3/20
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