+#' @section Methods: \describe{
+#' \item{\code{getSize()}}
+#' {Return number of series in dataset.}
+#' \item{\code{getStdHorizon()}}
+#' {Return number of time steps from serie[1] until midnight}
+#' \item{\code{append(new_time, new_centered_serie, new_level, new_exo, new_exo_hat)}}
+#' {Acquire a new vector of lists (time, centered_serie, level, exo, exo_hat).}
+#' \item{\code{getTime(index)}}
+#' {Get times at specified index.}
+#' \item{\code{getCenteredSerie(index)}}
+#' {Get centered serie at specified index.}
+#' \item{\code{getLevel(index)}}
+#' {Get level at specified index.}
+#' \item{\code{getSerie(index)}}
+#' {Get serie (centered+level) at specified index.}
+#' \item{\code{getExo(index)}}
+#' {Get exogenous variables at specified index.}
+#' \item{\code{getExoHat(index)}}
+#' {Get estimated exogenous variables at specified index.}
+#' \item{\code{getCoupleDays(first,last)}}
+#' {Get indices of no-NA series followed by no-NA, within [first,last] range.}}
+Data = R6::R6Class("Data",
+ private = list(
+ .data = list()
+ ),