Models and Diagnostics for Rasch Measurement Theory

Documentation for package ‘rasch’ version 1.12.0

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-- B --

btl	Fit comparative judgement models to paired comparisons
btl_dif	DIF analysis for paired comparisons
btl_dimensionality	Experimental 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_explanatory	Fit an explanatory comparative judgement model
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

-- C --

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

-- D --

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
dif_posthoc	Pairwise follow-up comparisons for a DIF term
dif_size	DIF differences between factor levels
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
drop_items	Drop items and refit

-- E --

equate_tests	Equate two test calibrations through their common items
explanatory_diagnostics	Diagnose fixed departures from an explanatory model
explanatory_test	Compare an explanatory model with its free calibration

-- F --

fit_summary_table	Test-of-fit summary as a table
frame_invariance	Test item invariance across frames

-- G --

guttman_table

Guttman-ordered response matrix and reproducibility

-- I --

item_moments

Category-score moments for a polytomous item

-- J --

judge_pair_surprise	Unexpected judgements of one judge, pair by pair
judge_surprise	Unexpected judgements of one judge

-- L --

lr_test

Compare the partial credit and rating scale models

-- P --

pcml	Estimate Rasch thresholds by pairwise conditional maximum likelihood
pcml_pc	Estimate Rasch thresholds using a principal-component parameterisation
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 polytomous-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	Plot fitted against generating 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

-- R --

rack_data	Reshape repeated measurements for racked or stacked analysis
rasch	Fit a Rasch model
rasch_efrm	Fit the extended frame of reference model
rasch_explanatory	Fit an explanatory Rasch model
rasch_mfrm	Fit a many-facet Rasch model
relax_btl_explanatory	Add a fixed object departure to an explanatory comparative judgement model
relax_explanatory	Relax a nominated explanatory restriction
report_document	Write an editable or print-ready analysis report
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
resolve_frames	Resolve items that do not hold across frames
run_app	Launch the rasch point-and-click graphical interface

-- S --

save_item_plots	Save a plot for every item
save_outputs	Save the outputs of a Rasch analysis
save_person_plots	Save a kidmap for every person
score_table	Raw score to measure conversion table
simulate_btl	Simulate paired-comparison data
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 Rasch data
simulate_rasch	Simulate person-by-item Rasch data
sim_apply	Apply a statistic across a simulation batch
sim_recovery	Compare fitted and generating parameters
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

-- T --

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

-- W --

wright_map

Draw a Wright map with WrightMap