Function reference • dexter

Database Project databases are an optional way to structure your data that greatly reduce the potential for mistakes and enhance reproducibility.
`start_new_project()`	Start a new project
`keys_to_rules()`	Derive scoring rules from keys
`open_project()`	Open an existing project
`close_project()`	Close a project
`add_booklet()` `add_response_data()`	Add response data to a project
`add_item_properties()`	Add item properties to a project
`add_person_properties()`	Add person properties to a project
`touch_rules()`	Add or modify scoring rules
`get_booklets()`	Booklets entered in a project
`get_design()`	Test design
`get_items()`	Items in a project
`get_persons()`	Persons in a project
`get_resp_data()` `get_resp_matrix()`	Functions for developers
`get_responses()`	Selecting data
`get_rules()`	Get scoring rules
`get_testscores()`	Get test scores
`get_variables()`	Variables that are defined in the project
`design_info()`	Information about the design
(neo) Classical test theory Evaluate the quality of items and testforms before further analysis
`tia_tables()`	Simple test-item analysis
`distractor_plot()`	Distractor plot
`fit_inter()`	Estimate the Interaction and the Rasch model
`fit_domains()`	Estimate the Rasch and the Interaction model per domain
`plot(<rim>)`	A plot method for the interaction model
`r_score_IM()`	Simulation from the interaction model
Item Response Theory model and predict
`fit_enorm()`	Fit the extended nominal response model
`plot(<prms>)`	Plot for the extended nominal Response model
`information()` `expected_score()` `r_score()` `p_score()`	Functions of theta
`ability()` `ability_tables()`	Estimate abilities
`plausible_values()`	Draw plausible values
`plausible_scores()`	Draw plausible test scores
`latent_cor()`	Latent correlations
`probability_to_pass()`	The probability to pass on a reference test given a score on a new booklet
`plot(<p2pass>)`	A plot method for probability_to_pass
`individual_differences()`	Test individual differences
Subgroup analysis How do people achieve a test score?
`DIF()`	Exploratory test for Differential Item Functioning
`plot(<DIF_stats>)`	plot method for pairwise DIF statistics
`profile_plot()`	Profile plot
`profile_tables()` `profiles()`	Profile analysis
Standard setting Setting performance standards
`standards_3dc()` `coef(<sts_par>)` `plot(<sts_par>)`	Standard setting
`standards_db()`	Export a standard setting database for use by the free 3DC application
Moving from other software
`start_new_project_from_oplm()`	Start a new project from oplm files
`read_oplm_par()`	Read item parameters from oplm PAR or CML files
Datasets
`ratedData`	Rated data
`ratedDataProperties`	Item properties in the rated data
`ratedDataRules`	Scoring rules for the rated data
`verbAggrData`	Verbal aggression data
`verbAggrProperties`	Item properties in the verbal aggression data
`verbAggrRules`	Scoring rules for the verbal aggression data

Reference

Database

(neo) Classical test theory

Item Response Theory

Subgroup analysis

Standard setting

Moving from other software

Datasets