Defines functions compile_trial_by_trial_results

Documented in compile_trial_by_trial_results

#' Compile trial-by-trial results
#' Compiles a data frame of trial-by-trial results for each participant.
#' This function is intended to be called once data have been collected
#' for several participants; it allows the researcher to inspect
#' MDT results on a trial-by-trial level.
#' Suppose that a participant completes 5 items in the test.
#' They will have 5 rows in the table, corresponding to their 5 items.
#' You can find the participant's rows by filtering by the "p_id" column.
#' The column "num" indexes these rows: 1 corresponds to the first item
#' they took, 2 corresponds to the second item, and so on.
#' The ability scores are given in the "ability_" columns; they tell
#' you the participant's estimated ability after having answered that
#' particular item. To get the participant's final estimated ability score,
#' look for the highest value of "num", in this case 5. Then look up the ability
#' score within that row.
#' There are different columns for the different ability
#' estimation methods, make sure you are looking at the right one.
#' The correct one to look at corresponds to the \code{final_ability.estimator}
#' parameter in your adaptive test. We most commonly use weighted likelihood,
#' i.e. "WL". This is stored in the column "ability_WL".
#' If you are unsure that you are looking at the right column,
#' you can compare the results to the CSV results that you can download
#' from the psychTestR admin interface, which provide
#' solely the participant's final ability score.
#' @param in_dir Results directory to process.
#' @param label Label that the MDT's results were saved under (typically "MDT").
#' @param combine Whether to combine results into one big data frame,
#' or instead to return a list of data frames, one for each participant.
#' @return A data frame, or list of data frames, of trial-by-trial results.
#' @export
compile_trial_by_trial_results <- function(in_dir = "output/results",
                                           label = "MDT",
                                           combine = TRUE) {
    in_dir = in_dir,
    label = label,
    combine = combine
pmcharrison/mdt documentation built on June 30, 2024, 1:21 a.m.