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 510 topics
Generalized Graded Unfold Model Seongho Bae 3/26/17
Re: Question about Package ‘mirt’ Phil Chalmers 3/25/17
multipleGroup Steven Kalinowski 3/25/17
Polychoric correlations in mirt. Possible? Elia Emmers 3/24/17
Computing fit statistics for bifactor model Sabeeh Baig 3/23/17
Is exist any item appropriateness measure in the mixedmirt() context? Seongho Bae 3/22/17
ERRORsubscript out of bounds and NAS introduced by coercion error in mirt package Reyhaneh 3/17/17
Error Message in itemfit eliandr...@gmail.com 3/16/17
item fit statistics for bifactor model Matthew Sunderland 3/16/17
Non-sensical DIF plotting results Conal Monaghan 3/16/17
Can I know the intraclass correlation (ICC) in mixedmirt() products? Seongho Bae 3/14/17
Model identification for unidimensional and bifactor models Yi Zheng 3/10/17
Can I run the multilevel bifactor model without the mirt.model() function? Seongho Bae 3/10/17
Why same trace lines? Todd McKay 3/10/17
Re: about MIRT package Phil Chalmers 3/1/17
Survey Rank Robson Branco 2/24/17
Using fscores on MultipleGroupClass object Jonathan Lehrfeld 2/23/17
A quick question from a lazy person. do you use the alpha scaling d=1.7 when estimating theta? Dimitrios Zacharatos 2/23/17
generated data for 5 items (with 3 categories) that have fixed slope/int parameters and applying GRM Todd McKay 2/23/17
Total score from two-dimensional model Conal Monaghan 2/23/17
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