- The Stan part of the package was split off into a new package mpt2irtStan.
This was done (a) to comply with new versions of rstan and rstantools, (b) to be able to have C++ code (
sample_pp()) in mpt2irt, and (c) for easier maintenance.
- Fixed bug in estimation of latent variance Sigma for uni-dimensional models (i.e., Steps and PCM)
- Added JAGS version of the shift model (introduced only in Stan in 0.1.1)
- Implementation of more thorough posterior predictive checking including several discrepancy measures.
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Implementation of the Steps Model (Verhelst; Tutz) as well as a shift model (both only in Stan)
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Bug fix with respect to the priors for the item parameters in the PCM
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Core functions now coherently return a list of arguments and setup parameters in a list called
args.
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Basic functionality via
fit_irtree()to fit the response style model of Boeckenholt (2012) and an extended version including acquiescence using JAGS and/or Stan -
Recovery simulations using
recovery_irtree() -
Functions to plot and summarize a fitted model