-append = function(private, new_time, new_centered_serie, new_level, new_exo_hat, new_exo)
+#'
+#' @inheritParams getSizeData
+#' @param new_time Time
+#' @param new_centered_serie Centered serie
+#' @param new_level Level
+#' @param new_exo Exogneous variables
+#' @param new_exo_hat Predicted exogenous variables
+appendData = function(private, new_time, new_centered_serie, new_level, new_exo, new_exo_hat)