In aluby/blackboxstudyR: Fits basic IRT models to FBI black box data

We'll proceed with an IRT analysis of the data under the inconclusive_mcar scoring scheme, which is how the data were scored under @ulery2011.

im_scored = score_bb_data(TestResponses, "inconclusive_mcar")

Scoring the black box data as above gives us the response variable ($y$). The irt_data_bb function takes the original black box data, along with the scored variable produced by score_bb_data, and produces a list object in the form needed by Stan to fit the IRT models. If you wish to fit the models on a different set of data, you can do so if the dataset has been formatted as a list object with the same attributes as the irt_data_bb function output (see package documentation for additional details).

im_data = irt_data_bb(TestResponses, im_scored)

We can now use fit_rasch to fit the Rasch models.

im_model = fit_rasch(im_data)

aluby/blackboxstudyR documentation built on May 8, 2019, 8:07 a.m.