# Pairwise Conditional Rasch Measurement Analysis and Diagnostics

## Documentation for package ‘rasch’ version 1.11.7

- DESCRIPTION file
- User guides, package vignettes and other documentation
- Package NEWS
- Package README

## Help Pages

btl | Fit the Bradley-Terry-Luce model to paired comparisons
btl_dif | DIF analysis for paired comparisons
btl_dimensionality | Residual dimensionality of paired comparisons
btl_efrm | Fit the extended frame of reference model for paired comparisons
btl_equate | Equate two paired-comparison calibrations through their common objects
btl_information | Information and targeting of a paired-comparison design
btl_next_pairs | Recommend the next informative comparisons (adaptive step)
btl_transitivity | Transitivity of paired comparisons
chisq_detail | Class-interval detail for one item's chi-square test of fit
combine_items | Combine items into subtests and re-analyse
compare_fits | Compare fitted Rasch models
ctt_table | Traditional (classical test theory) statistics
dependence_magnitude | Estimate the magnitude of response dependence between two items
dif_anova | Differential item functioning by residual analysis of variance
dif_contrasts | Planned DIF contrasts derived from the factor structure
dif_size | DIF magnitude in logits with pairwise comparisons
dimensionality_magnitude | Magnitude of multidimensionality from a subtest analysis
dimensionality_test | Residual-component test of unidimensionality
distractor_analysis | Distractor analysis for multiple-choice items
distractor_rescore | Propose polytomous option scores from the distractor evidence
equate_tests | Equate two test calibrations through their common items
fit_summary_table | Test-of-fit summary as a table
guttman_table | Guttman-ordered response matrix and reproducibility
item_moments | Category-score moments for a polytomous item
judge_pair_surprise | Unexpected judgements of one judge, pair by pair
judge_surprise | Unexpected judgements of one judge
lr_test | Likelihood-ratio test of the partial credit against the rating scale model
pcml | Estimate Rasch thresholds by pairwise conditional maximum likelihood
pcml_pc | Estimate Rasch thresholds via the Andrich principal-components reparameterisation
person_extrapolated | Person measures with extrapolated extreme scores
person_wle | Warm's weighted likelihood estimates by raw score
plot_btl | Plot Bradley-Terry-Luce object locations
plot_btl_categories | Plot graded-comparison category curves
plot_btl_dependence | Plot a within-judge dependence effect
plot_btl_dim_map | Residual map of the leading paired-comparison bimension
plot_btl_equate | Plot a paired-comparison equating comparison
plot_btl_icc | Plot an object characteristic curve
plot_btl_judge_map | Unexpected-judgement map for one judge (pair level)
plot_btl_scree | Scree of paired-comparison residual bimensions
plot_btl_targeting | Targeting plot for a paired-comparison design
plot_btl_transitivity | Consistency plot for paired-comparison transitivity
plot_btl_units | Plot the frame units of a paired-comparison EFRM fit
plot_catfreq | Plot category frequencies
plot_ccc | Plot category probability curves
plot_distractors | Plot multiple-choice option curves
plot_equate | Plot a test-equating comparison
plot_facets | Plot facet severities
plot_frames | Plot frame units
plot_guttman | Plot the Guttman scalogram
plot_icc | Plot an item characteristic curve
plot_icc_frames | Plot an item's characteristic curves across frames
plot_item_map | Plot the item map (location against fit residual)
plot_kidmap | Plot a kidmap
plot_pca | Plot residual principal-component loadings
plot_pca_biplot | Biplot of the first two residual components
plot_pcc | Plot a person characteristic curve
plot_person_fit | Plot person fit
plot_pimap | Plot the person-item threshold distribution
plot_recovery | Recovery scatter of planted against recovered parameters
plot_resid_cor | Plot the residual-correlation heatmap
plot_resid_dist | Plot the fit residual distribution
plot_scree | Scree plot of the residual components with parallel analysis
plot_tcc | Plot the test characteristic curve
plot_threshold_map | Plot the threshold map
plot_threshold_prob | Plot threshold probability curves
plot_tif | Plot the test information function
plot_wright | Plot a Wright map
rack_data | Reshape repeated measurements for racked or stacked analysis
rasch | Fit and diagnose a Rasch model by pairwise conditional estimation
rasch_efrm | Fit the extended frame of reference model
rasch_mfrm | Fit a many-facet Rasch model
report_html | Write a self-contained HTML report of a Rasch analysis
residual_correlations | Residual correlations for local dependence (Yen's Q3)
residual_pca | Principal components of the residual correlations
resolve_dif | Resolve differential item functioning by iterative item splitting
run_app | Launch the rasch graphical interface
save_item_plots | Save a plot for every item
save_outputs | Save every output of a Rasch analysis to a folder
save_person_plots | Save a kidmap for every person
score_table | Raw score to measure conversion table
simulate_btl | Simulate paired-comparison (BTL) data with dial-in misfit
simulate_btl_efrm | Simulate paired-comparison EFRM data with differing frame units
simulate_efrm | Simulate extended frame-of-reference data with differing units
simulate_mfrm | Simulate many-facet (rated) data with dial-in misfit
simulate_rasch | Simulate person-by-item Rasch data with dial-in misfit
sim_recovery | Parameter recovery of a fit against the simulation truth
sim_replicate | Replicate a simulation for Monte Carlo studies
split_items | Split items by a person factor to resolve DIF
spread_test | Spread-parameter test for dependence within subtests
stack_data | Reshape repeated measurements for racked or stacked analysis
tailored_analysis | Tailored analysis for guessing
targeting_table | Targeting and reliability summary as a table
test_information | Test information function
threshold_index | Enumerate item-category thresholds