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#' @title Area Under ROC Curve (AUC)
#'
#' @description Area Under Curve (AUC) for Receiver Operating Characteristic.
#'
#' @param object An object of class \code{explainer} created with function
#' \code{\link[DALEX]{explain}} from the DALEX package.
#' @param data New data that will be used to calculate the score.
#' Pass \code{NULL} if you want to use \code{data} from \code{object}.
#' @param y New y parameter will be used to calculate score.
#' @param ... Other arguments dependent on the type of score.
#'
#' @return An object of class \code{auditor_score}.
#'
#' @examples
#' data(titanic_imputed, package = "DALEX")
#'
#' # fit a model
#' model_glm <- glm(survived ~ ., family = binomial, data = titanic_imputed)
#'
#' glm_audit <- audit(model_glm,
#' data = titanic_imputed,
#' y = titanic_imputed$survived)
#'
#' # calculate score
#' score_auc(glm_audit)
#'
#' @seealso \code{\link{plot_roc}}
#'
#' @export
score_auc <- function(object, data = NULL, y = NULL, ...) {
if(!("explainer" %in% class(object))) stop("The function requires an object created with explain() function from the DALEX package.")
# use new data
if (!is.null(data)){
object$y <- y
object$y_hat <- object$predict_function(object$model, data)
}
observed <- object$y
predicted <- object$y_hat
# code based on the solution from the DALEX package
tpr_tmp <- tapply(observed, predicted, sum)
TPR <- c(0,cumsum(rev(tpr_tmp)))/sum(observed)
fpr_tmp <- tapply(1 - observed, predicted, sum)
FPR <- c(0,cumsum(rev(fpr_tmp)))/sum(1 - observed)
auc <- sum(diff(FPR)*(TPR[-1] + TPR[-length(TPR)])/2)
roc_results <- list(
name = "auc",
score = auc
)
class(roc_results) <- "auditor_score"
return(roc_results)
}
#' @title One minus Area Under ROC Curve (AUC)
#'
#' @description One minus Area Under Curve (AUC) for Receiver Operating Characteristic.
#'
#' @param object An object of class \code{explainer} created with function
#' \code{\link[DALEX]{explain}} from the DALEX package.
#' @param data New data that will be used to calculate the score.
#' Pass \code{NULL} if you want to use \code{data} from \code{object}.
#' @param y New y parameter will be used to calculate score.
#' @param ... Other arguments dependent on the type of score.
#'
#' @return An object of class \code{auditor_score}.
#'
#' @examples
#' data(titanic_imputed, package = "DALEX")
#'
#' # fit a model
#' model_glm <- glm(survived ~ ., family = binomial, data = titanic_imputed)
#'
#' glm_audit <- audit(model_glm,
#' data = titanic_imputed,
#' y = titanic_imputed$survived)
#'
#' # calculate score
#' score_one_minus_auc(glm_audit)
#'
#' @export
score_one_minus_auc <- function(object, data = NULL, y = NULL, ...) {
if(!("explainer" %in% class(object))) stop("The function requires an object created with explain() function from the DALEX package.")
ret <- 1 - score_auc(object, data, y, ...)$score
roc_results <- list(
name = "one_minus_auc",
score = ret
)
class(roc_results) <- "auditor_score"
return(roc_results)
}
#' @rdname score_auc
#' @export
scoreROC<- function(object) {
warning("Please note that 'scoreROC()' is now deprecated, it is better to use 'score_auc()' instead.")
score_auc(object)
}
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