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 1-20 of 420 topics
non-normally distributed latent trait Oce 7/30/16
effect size for item misfit (S_X2) Michael Paul Grosz 7/29/16
how to override maxit in GPFoblq Oce 7/28/16
mirtCluster() in Linux S.A. Mousavi 7/28/16
Direction of wording issues Conal Monaghan 7/28/16
Warning: Log-likelihood was decreasing near the ML solution. EM method may be unstable Michael Paul Grosz 7/25/16
DTF Jae Yung Kwon 7/25/16
Re: mirt: standard error of b parameter Phil Chalmers 7/24/16
Ipsative modeling Keith Lau 7/16/16
Bayes Factor in mirt anova Pedro Alberto Barbetta 7/7/16
How does mirt function manage missing data ? Pierre Michel 7/4/16
Does "random=list(F1=~...)" work in mixedmirt for multidimensional model? Keith Lau 7/3/16
itemtype for mixedmirt Keith Lau 6/26/16
Re: Question on the bifactor invariance modeling Phil Chalmers 6/24/16
Re: PRIOR Phil Chalmers 6/21/16
How to simulate item responses from multidimensional partial credit model? David Y 6/17/16
Global Optimizers Keith Lau 6/12/16
vcov() for exploratory models Gina Velázquez 6/10/16
marginal reliability Serpil çelikten 6/9/16
Does mirt allow discrete item parameter? Keith Lau 6/6/16
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