conquestr - An R Package to Extend 'ACER ConQuest'

Extends 'ACER ConQuest' through a family of functions designed to improve graphical outputs and help with advanced analysis (e.g., differential item functioning). Allows R users to call 'ACER ConQuest' from within R and read 'ACER ConQuest' System Files (generated by the command `put` <https://conquestmanual.acer.org/s4-00.html#put>). Requires 'ACER ConQuest' version 5.40 or later. A demonstration version can be downloaded from <https://shop.acer.org/collections/acer-conquest-5>.