irt 0.1.4

• Bug fix: An Itempool object with one testlet can be printed without an error.
• Added $item_ids to testlet object to get the ids of the items within the testlet.
• Fixed bugs in plot_empirical_icc() function.

irt 0.1.3

• Added $max_score for Testlet objects. For a given Testlet object t1, t1$max_score returns the maximum obtainable score by all items within the testlet.
• Added $resp_item_list for Itempool objects. For an Itempool object ip, ip$resp_item_list will combine items that are not in a testlet and items within a testlet and returns a list object that is composed of only Item objects.

irt 0.1.2

• Package can be used in MacOS as well. Resolved compiler related issues.
• Added est_bilog() function to estimate item parameters for “1PL”, “2PL” and “3PL” models using BILOG-MG on computers with Windows OS. This function requires an installed BILOG-MG program on the machine.

irt 0.1.0

• This is the initial release of the package.