helpers: Helper functions for ATA

In Rata: Automated Test Assembly

Description

ata_glpk solves the the MIP model using GLPK

helper functions for ATA

ata_check_item_pool checks the input of the item pool

ata_item_set_groups creates grouping indices for item sets

ata_form_map creates a map of external and internal forms

ata_get_form_index finds the internal form indices for the form input

ata_get_obj_coef finds real coefficients for the coefficient input

ata_append appends constraints to the ATA model

x retrieves items from the result matrix

ata_results_to_model converts results from the 'by-form' format to the 'by-model' format

ata_results_to_dataframe converts results from the 'by-model' format to the 'data.frame' format

ata_lpsolve solves the the MIP model using lp_solve

Usage

ata_glpk(x, time_limit, message, ...)

ata_check_item_pool(pool)

ata_item_set_groups(pool, opts)

ata_form_map(n_forms, opts)

ata_get_form_index(x, forms, collapse, internal_index)

ata_get_obj_coef(x, coef, compensate)

ata_append(x, mat, dir, rhs)

ata_extract_items(x)

ata_results_to_model(items)

ata_results_to_dataframe(items)

ata_lpsolve(x, time_limit, message, ...)

Arguments

x	an ATA object
time_limit	the time limit in seconds passed along to the solver
message	TRUE to print messages from the solver
...	additional control parameters for the solver
pool	the item pool, a list of 3pl, gpcm, and grm items
opts	the options, a list
n_forms	the nubmer of forms to be assembled
forms	form indices
collapse	TRUE to collaspe forms into one form
internal_index	TRUE to use internal form index
coef	coefficients
compensate	TRUE to combine coefficients
mat	coefficient matrix
dir	direction
rhs	right-hand-side value
items	the assembled items

Rata documentation built on Oct. 30, 2019, 12:12 p.m.