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irt 0.2.8

  • Added kappa_coef() function to calculate Cohen's weighted/unweighted Kappa coefficient.
  • Response objects prints 'misc' fields without an error when there is a factor type variable.
  • Fixed an error in the function irt:::marginal_reliability(..., method = "empirical").

irt 0.2.6

  • Plot functions can now suppress plot titles by setting title = NULL.
  • item_analysis() function now has a new argument stats where only selected item analysis statistics can be calculated.
  • item_analysis() function can now calculate pval_unadj which is simply the mean of item scores. pval is still the mean of item scores divided by each item's maximum possible score.
  • Added area_between_icc() function to calculate the area between two item characteristic curves of two unidimensional dichotomous items. The function can calculate either exact area (except when 3PL with different pseudo-guessing parameters) or area between two theta values.
  • cat_sim() function can use MAP (maximum-a-posteriori or Bayes Modal) and MAP + ML (i.e. MAP until an imperfect response string and ML after) ability estimation methods.
  • Responses, items administered, administered item IDs, estimates before or after the administration of an item can be extracted from the individual CAT output. For details, see "?$.cat_output".
  • Added output_type argument to est_ability(, output_type = ) function with available following output types: "list", "data.frame", "tibble". Previously, the output was only a "list".

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.