A system for the management, assessment, and psychometric analysis of data from educational and psychological tests. Developed at Cito, The Netherlands, with subsidy from the Dutch Ministry of Education, Culture, and Science.
Added function ability_tables to generate score transformation tables for arbitrary subsets of items. Ability and ability_tables can now also take Jeffreys prior and variatons of the normal prior and can optionally output standard errors.
Added function Plausible_scores to generate scores on arbitrary itemsets (or the entire bank).
Updates to documentation.
Plausible_values can now work with covariates. Fit_enorm can optionally take fixed_parameters into account.
Significant speed increases in profile_plot, iTIA and iModels and minor speed increases in other functions.
Further includes more user control over plotting parameters, updates to documentation, several bugfixes and some smaller updates.
Included Rdpack in Imports at the request of CRAN, and fixed 4 minor bugs
We go straight from version 0.1.7 to version 0.4.2 in a major new release. The functionality envisaged for two other related packages, enorm and roger, has now been all incorporated into dexter.
The database has been completely rewritten. Databases created with 0.1.7 can be imported but are no longer maintained.
Many functions now support flexible subsetting of data through a predicate expression; furthermore, the data source can be either the dexter database (more usual), or a data frame or tibble. The latter can be useful in simple simulations or in some non-standard situations.
Basic test and item analysis has been extended with two interactive tools based on shiny, and with an exploratory tool to search for DIF.
Version 0.4.2 estimates the Extended NOminal Response Model (ENORM) by either CML or a Gibbs sampler, computes person scores by either MLE, EAP, or plausible values, and provides a new test for the hypothesis of no true individual differences. In addition, it supports a method for standard settings known as 3DC.
Several vignettes have been added to explain the new features in detail.