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 1-21 of 732 topics
mirt version 1.28 on CRAN Phil Chalmers 5/23/18
M2 for latent regression and multidimensional models Balal Ezanloo 5/24/18
possibility of entering item and person parameters manually Balal Ezanloo 5/24/18
multipleGroup - effect of invariance parameters on model indentification Leigh 5/24/18
Speed up MAP estimation in multidimensional CAT Dirk Pelt 5/22/18
what is the difference of item threshold, intercept and difficulty Balal Ezanloo 5/19/18
Error preventing item fit from being calculated for Multiple Group Estimation model Daniel McKelvey 5/19/18
Difficulty switching directions when modeling independently vs. when using Multiple Group Estimation Daniel McKelvey 5/19/18
how to gain test information in the direction of just first trait Balal Ezanloo 5/19/18
m2 dos not work for missing data Balal Ezanloo 5/19/18
M2 system is computationally singular error Gareth McCray 5/19/18
scoring with insufficient response categories in the response data Emily 5/18/18
is possible to use mirt to calculate conditional SEM of a dataset of assessment results yuxi...@gmail.com 5/18/18
Interpreting fit statistics based on the M2 Danny Swan 5/17/18
Estimated slope parameter order David Perlaza 5/17/18
which.par jksha...@gmail.com 5/15/18
plot item information curve for all items Shensheng Wang 5/15/18
item fit statistics Shimon Sarraf 5/14/18
Multigroup covariance structure Josh Kazman 5/10/18
"M2 cannot be calulated since df is too low" I. L. H. 5/10/18
Confidence intervals for fscores Tim 5/10/18
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