Contains data and script for the analysis reported in section 'A Critical Test of ROC Symmetry'.
`analysis_Mafc.r` contains the code performing the complete analysis using `rstanarm`. It also calculates the reported Bayes factors. Requires the data in file `Mafc_data.txt`.
The data in the `txt` file (`Mafc_data.txt`) is mostly self-explanatory with the following columns:
- `subj`: participant identifier.
- `ma`: number of response options with three levels: "2AFC", "3AFC", and "4AFC".
- `focus`: instruction whether to choose the `valid` or `invalid` item among the presented ones.
- `correct`: position of correct item among presented ones (from 1 to $M$, i.e., up to 4).
- `chosen`: position of selected item.
- `rt`: response time in milliseconds.
- `order_cond`: which `focus` was presented first.
- `acc`: correct = 1, error = 0.