easyRaschBayes 0.3.0 (development)

• New custom brms family hurdle_acat for hurdle partial credit models (H-PCM). This is written by Kristoffer Magnusson
• Several adapted (experimental) functions for H-PCM, all using the *_hpcm suffix.
  • infit_statistic_hpcm()
  • q3_statistic_hpcm()
  • item_parameters_hpcm()
  • person_parameters_hpcm()
  • RMUreliability_hpcm()
  • plot_icc_hpcm()
  • plot_targeting_hpcm()
• Bug fix - changed post processing functions to use median_hdci() instead of median_hdi() to avoid issues with multimodal posteriors.
• Bug fix - corrected the WLE person estimates in person_parameters() and person_parameters_hpcm(). The polytomous Warm bias correction had the wrong sign, biasing estimates outward; WLE now matches catR/TAM. Extreme (minimum and maximum) scores now receive proper finite WLE estimates instead of being clamped to the theta_range bounds.

easyRaschBayes 0.2.0.1

• Fix for plot_icc() theta values.

easyRaschBayes 0.2.0

• Updates:
  • infit_statistic() is now faster and defaults to not output outfit statistics, since these are of dubious value (see Müller 2020 and Johansson, 2025).
  • item_restscore_statistic() is now faster and has output similar to infit_post().
  • q3_statistic() is now faster and has output similar to infit_post().
  • plot_residual_pca() is now faster.
• Three post-processing helper functions that output a list with result table(s) and a plot:
  • infit_post() for the output of infit_statistic()
  • item_restscore_post() for the output of item_restscore_statistic()
  • q3_post() for the output of q3_statistic()
• Other new functions:
  • plot_icc() can both produce a basic conditional Item Characteristic Curves plot and optionally a DIF ICC plot, the latter also reporting a partial gamma DIF magnitude coefficient. This is inspired by iarm::ICCplot()
  • item_parameters() to retrieve item threshold locations
  • person_parameters() to retrieve person locations (latent scores) using EAP and WLE, and also a transformation table from ordinal sum score to EAP/WLE.
  • posterior_to_prior() that extracts priors from a brmsfit model that may be useful in model fit assessment. An article will be added later, exploring this further.
  • plot_tile(), plot_bars(), and plot_stackedbars() uses wide format item data to create plots to review response patterns.

easyRaschBayes 0.1.0

• Initial release.