sirt

Supplementary functions for item response models aiming to complement existing R packages. The functionality includes among others multidimensional compensatory and noncompensatory IRT models (Reckase, 2009, doi:10.1007/978-0-387-89976-3), MCMC for hierarchical IRT models and testlet models (Fox, 2010, doi:10.1007/978-1-4419-0742-4), NOHARM (McDonald, 1982, doi:10.1177/014662168200600402), Rasch copula model (Braeken, 2011, doi:10.1007/s11336-010-9190-4; Schroeders, Robitzsch & Schipolowski, 2014, doi:10.1111/jedm.12054), faceted and hierarchical rater models (DeCarlo, Kim & Johnson, 2011, doi:10.1111/j.1745-3984.2011.00143.x), ordinal IRT model (ISOP; Scheiblechner, 1995, doi:10.1007/BF02301417), DETECT statistic (Stout, Habing, Douglas & Kim, 1996, doi:10.1177/014662169602000403), local structural equation modeling (LSEM; Hildebrandt, Luedtke, Robitzsch, Sommer & Wilhelm, 2016, doi:10.1080/00273171.2016.1142856).

Last 30 days

This package has been downloaded 3,455 times in the last 30 days. Now we’re talking! This work is officially 'heard of in academic circles', just like those wild research papers on synthetic bananas. The following heatmap shows the distribution of downloads per day. Yesterday, it was downloaded 27 times.

The following line graph shows the downloads per day. You can hover over the graph to see the exact number of downloads per day.

Last 365 days

This package has been downloaded 32,832 times in the last 365 days. The downloads are officially high enough to crash an underfunded departmental server. Quite an accomplishment! The day with the most downloads was Feb 11, 2025 with 408 downloads.

The following line graph shows the downloads per day. You can hover over the graph to see the exact number of downloads per day.