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#' Heart Failure Data
#'
#' @description
#' A dataset containing the ages and other attributes of almost 300 cases.
#'
#' @details
#' Heart failure is a common event caused by Cardiovascular diseasess and this dataset contains 12 features that can be used to predict mortality by heart failure.
#'
#' @format A data frame with 299 rows and 13 variables. The variables are as follows:
#' \describe{
#' \item{age}{patient's age.}
#' \item{anaemia}{decrease of red blood cells or hemoglobin (boolean), Yes, No.}
#' \item{cpk_enzyme}{level of the CPK(creatinine phosphokinase) enzyme in the blood (mcg/L).}
#' \item{diabetes}{if the patient has diabetes (boolean), Yes, No.}
#' \item{ejection_fraction}{percentage of blood leaving the heart at each contraction (percentage).}
#' \item{hblood_pressure}{high_blood_pressure. if the patient has hypertension (boolean), Yes, No.}
#' \item{platelets}{platelets in the blood (kiloplatelets/mL).}
#' \item{creatinine}{level of serum creatinine in the blood (mg/dL).}
#' \item{sodium}{level of serum sodium in the blood (mEq/L).}
#' \item{sex}{patient's sex (binary), Male, Female.}
#' \item{smoking}{if the patient smokes or not (boolean), Yes, No.}
#' \item{time}{follow-up period (days).}
#' \item{death_event}{if the patient deceased during the follow-up period (boolean), Yes, No.}
#' }
#' @docType data
#' @keywords datasets
#' @name heartfailure
#' @usage data(heartfailure)
#' @references {
#' Davide Chicco, Giuseppe Jurman: Machine learning can predict survival of patients with heart failure from serum creatinine and ejection fraction alone. BMC Medical Informatics and Decision Making 20, 16 (2020).
#' <https://doi.org/10.1186/s12911-020-1023-5>
#' }
#' @source {
#' "Heart Failure Prediction" in Kaggle <https://www.kaggle.com/andrewmvd/heart-failure-clinical-data>, License : CC BY 4.0
#' }
NULL
# library(dplyr)
# heartfailure <- read.csv("pkg_data/heart_failure_clinical_records_dataset.csv")
# as_yn <- function(x) {
# as.factor(ifelse(x == 1 , "Yes", "No"))
# }
#
# heartfailure <- heartfailure %>%
# rename_all(tolower) %>%
# mutate(age = as.integer(age),
# anaemia = as_yn(anaemia),
# creatinine_phosphokinase = as.numeric(creatinine_phosphokinase),
# diabetes = as_yn(diabetes),
# ejection_fraction = as.numeric(ejection_fraction),
# high_blood_pressure = as_yn(high_blood_pressure),
# platelets = as.numeric(platelets),
# serum_creatinine = as.numeric(serum_creatinine),
# serum_sodium = as.numeric(serum_sodium),
# sex = as.factor(ifelse(sex == 1 , "Male", "Female")),
# smoking = as_yn(smoking),
# time = as.integer(time),
# death_event = as_yn(death_event)) %>%
# rename(cpk_enzyme = creatinine_phosphokinase,
# hblood_pressure = high_blood_pressure,
# creatinine = serum_creatinine,
# sodium = serum_sodium)
# save(heartfailure, file = "data/heartfailure.rda")
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