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 443 topics
Questions on validation of short scale Yuen Wan Ho 8/25/16
Plot high dimensional (factors >3) models? Elia Emmers 8/24/16
mirt 1.19 on CRAN Phil Chalmers 8/23/16
testing for significant difference in item difficulty Balazs Klein 8/19/16
Can I calculate item fit for mdirt object include NA values in the data? Seongho Bae 8/18/16
How to increase NCYCLES in the mdirt function? Seongho Bae 8/18/16
Re: Setting values for discrimination parameters Phil Chalmers 8/17/16
forced_choice option not working Veysel Şahin 8/17/16
fscores + indeterminacy Michael Paul Grosz 8/17/16
Error when using itemfit() function. Elia Emmers 8/16/16
What happened to mvdisc and mvint_1? Elia Emmers 8/16/16
Re: Questions regarding information and reliability in MIRT package Phil Chalmers 8/15/16
Item Characteristic Function in mirt package Sukanya Moudgalya 8/15/16
factor scores using covariates on a group data Souvik Bhattacharya 8/12/16
Can I consider item fit in the mixedmirt() context? Seongho Bae 8/11/16
Can I fit unordered (nominal type) data with mdirt function? Seongho Bae 8/11/16
how to explain what the difficulty parameter d really represents? Oce 8/8/16
DIF with Polytomous Items Chris Castille 8/5/16
is it possible to use bfactor with method "QMCEM" Oce 8/5/16
Multigroup with 4 groups, with a few questions not applicable to 2 of the groups Oce 8/3/16
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