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#' @template surv_measure
#' @templateVar title Root Mean Squared Error
#' @templateVar fullname MeasureSurvRMSE
#'
#' @template param_se
#'
#' @description
#' Calculates the root mean squared error (RMSE).
#'
#' The RMSE is defined by
#' \deqn{\sqrt{\frac{1}{n} \sum ((t - \hat{t})^2)}}{\sqrt(1/n \sum ((t - t*)^2))}
#' where \eqn{t} is the true value and \eqn{\hat{t}}{t*} is the prediction.
#'
#' Censored observations in the test set are ignored.
#'
#' @family response survival measures
#' @export
MeasureSurvRMSE = R6::R6Class("MeasureSurvRMSE",
inherit = MeasureSurv,
public = list(
#' @description Creates a new instance of this [R6][R6::R6Class] class.
initialize = function() {
ps = ps(
se = p_lgl(default = FALSE)
)
ps$values$se = FALSE
super$initialize(
id = "surv.rmse",
range = c(0, Inf),
minimize = TRUE,
predict_type = "response",
label = "Root Mean Squared Error",
man = "mlr3proba::mlr_measures_surv.rmse",
param_set = ps
)
}
),
private = list(
.score = function(prediction, ...) {
if (self$param_set$values$se) {
mse = surv_mse(prediction$truth, prediction$response)
mse$se / (2 * sqrt(mean(mse$mse)))
} else {
sqrt(mean(surv_mse(prediction$truth, prediction$response)$mse))
}
}
)
)
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