mirror of
https://github.com/agdamsbo/stRoke.git
synced 2024-11-22 13:00:23 +01:00
98 lines
4.2 KiB
R
98 lines
4.2 KiB
R
#' Calculate age in years, months, or days
|
|
#'
|
|
#' @param dob Date of birth
|
|
#' @param enddate End date for age calculation (default is Sys.Date())
|
|
#' @param units Units for age calculation (default is "years").
|
|
#' Can be c("days", "months", "years")
|
|
#' @param precise Option to calculate age precisely (default is TRUE)
|
|
#' @return Age
|
|
#' @export
|
|
#'
|
|
#' @examples
|
|
#' age_calc(dob = as.Date("1995-04-25"), enddate = as.Date("2020-04-25"), units = "years")
|
|
#' # Kim Larsen (cpr is known from album)
|
|
#' dob<-as.Date("1945-10-23")
|
|
#' date<-as.Date("2018-09-30")
|
|
#' trunc(age_calc(dob,date))
|
|
#' @references
|
|
#' Becker, J.P. (2020). eeptools: An R Package for Teaching and Learning Ecology and Evolutionary Biology. Journal of Statistical Software, 93(2), 1-27. doi: 10.18637/jss.v093.i02
|
|
#'
|
|
#' @seealso \code{\link[lubridate]{time_length}}
|
|
#' @keywords date time age
|
|
|
|
age_calc<-function (dob, enddate = Sys.Date(), units = "years", precise = TRUE)
|
|
## Build upon the work of Jason P. Becker, as part of the eeptools
|
|
## Alternative is to just use lubridate::time_length
|
|
{
|
|
|
|
if (!inherits(dob, "Date") | !inherits(enddate, "Date")) {
|
|
stop("Both dob and enddate must be Date class objects")
|
|
}
|
|
|
|
if (length(dob)==1 && enddate < dob) {
|
|
stop("End date must be a date after date of birth")
|
|
}
|
|
|
|
if (length(dob)>1 && any(enddate < dob)) {
|
|
stop("End date must be a date after date of birth")
|
|
}
|
|
|
|
start <- as.POSIXlt(dob)
|
|
end <- as.POSIXlt(enddate)
|
|
|
|
if (precise) {
|
|
start_is_leap <- ifelse(start$year%%400 == 0, TRUE, ifelse(start$year%%100 ==
|
|
0, FALSE, ifelse(start$year%%4 == 0, TRUE, FALSE)))
|
|
end_is_leap <- ifelse(end$year%%400 == 0, TRUE, ifelse(end$year%%100 ==
|
|
0, FALSE, ifelse(end$year%%4 == 0, TRUE, FALSE)))
|
|
}
|
|
if (units == "days") {
|
|
result <- difftime(end, start, units = "days")
|
|
}
|
|
else if (units == "months") {
|
|
months <- sapply(mapply(seq, as.POSIXct(start), as.POSIXct(end),
|
|
by = "months", SIMPLIFY = FALSE), length) - 1
|
|
if (precise) {
|
|
month_length_end <- ifelse(end$mon == 1 & end_is_leap,
|
|
29, ifelse(end$mon == 1, 28, ifelse(end$mon %in%
|
|
c(3, 5, 8, 10), 30, 31)))
|
|
month_length_prior <- ifelse((end$mon - 1) == 1 &
|
|
start_is_leap, 29, ifelse((end$mon - 1) == 1,
|
|
28, ifelse((end$mon - 1) %in% c(3, 5, 8, 10),
|
|
30, 31)))
|
|
month_frac <- ifelse(end$mday > start$mday, (end$mday -
|
|
start$mday)/month_length_end, ifelse(end$mday <
|
|
start$mday, (month_length_prior - start$mday)/month_length_prior +
|
|
end$mday/month_length_end, 0))
|
|
result <- months + month_frac
|
|
}
|
|
else {
|
|
result <- months
|
|
}
|
|
}
|
|
else if (units == "years") {
|
|
years <- sapply(mapply(seq, as.POSIXct(start), as.POSIXct(end),
|
|
by = "years", SIMPLIFY = FALSE), length) - 1
|
|
if (precise) {
|
|
start_length <- ifelse(start_is_leap, 366, 365)
|
|
end_length <- ifelse(end_is_leap, 366, 365)
|
|
start_day <- ifelse(start_is_leap & start$yday >=
|
|
60, start$yday - 1, start$yday)
|
|
end_day <- ifelse(end_is_leap & end$yday >= 60, end$yday -
|
|
1, end$yday)
|
|
year_frac <- ifelse(start_day < end_day, (end_day -
|
|
start_day)/end_length, ifelse(start_day > end_day,
|
|
(start_length - start_day)/start_length + end_day/end_length,
|
|
0))
|
|
result <- years + year_frac
|
|
}
|
|
else {
|
|
result <- years
|
|
}
|
|
}
|
|
|
|
else {
|
|
stop("Unrecognized units. Please choose years, months, or days.")
|
|
}
|
|
result
|
|
} |