mirror of
https://github.com/agdamsbo/daDoctoR.git
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76 lines
3.4 KiB
R
76 lines
3.4 KiB
R
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#' Calculating age from date of birth
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#'
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#' For age calculations.
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#' @param dob Date of birth.
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#' @param enddate Date to calculate age at.
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#' @keywords age
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#' @export
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#' @examples
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#' age_calc()
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age_calc<-function (dob, enddate = Sys.Date(), units = "years", precise = TRUE)
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## Build upon the work of Jason P. Becker, as part of tihe eeptools
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{
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if (!inherits(dob, "Date") | !inherits(enddate, "Date")) {
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stop("Both dob and enddate must be Date class objects")
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}
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if (enddate < dob) {
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stop("End date must be a date after date of birth")
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}
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start <- as.POSIXlt(dob)
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end <- as.POSIXlt(enddate)
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if (precise) {
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start_is_leap <- ifelse(start$year%%400 == 0, TRUE, ifelse(start$year%%100 ==
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0, FALSE, ifelse(start$year%%4 == 0, TRUE, FALSE)))
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end_is_leap <- ifelse(end$year%%400 == 0, TRUE, ifelse(end$year%%100 ==
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0, FALSE, ifelse(end$year%%4 == 0, TRUE, FALSE)))
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}
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if (units == "days") {
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result <- difftime(end, start, units = "days")
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}
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else if (units == "months") {
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months <- sapply(mapply(seq, as.POSIXct(start), as.POSIXct(end),
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by = "months", SIMPLIFY = FALSE), length) - 1
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if (precise) {
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month_length_end <- ifelse(end$mon == 1 & end_is_leap,
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29, ifelse(end$mon == 1, 28, ifelse(end$mon %in%
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c(3, 5, 8, 10), 30, 31)))
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month_length_prior <- ifelse((end$mon - 1) == 1 &
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start_is_leap, 29, ifelse((end$mon - 1) == 1,
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28, ifelse((end$mon - 1) %in% c(3, 5, 8, 10),
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30, 31)))
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month_frac <- ifelse(end$mday > start$mday, (end$mday -
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start$mday)/month_length_end, ifelse(end$mday <
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start$mday, (month_length_prior - start$mday)/month_length_prior +
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end$mday/month_length_end, 0))
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result <- months + month_frac
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}
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else {
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result <- months
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}
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}
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else if (units == "years") {
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years <- sapply(mapply(seq, as.POSIXct(start), as.POSIXct(end),
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by = "years", SIMPLIFY = FALSE), length) - 1
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if (precise) {
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start_length <- ifelse(start_is_leap, 366, 365)
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end_length <- ifelse(end_is_leap, 366, 365)
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start_day <- ifelse(start_is_leap & start$yday >=
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60, start$yday - 1, start$yday)
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end_day <- ifelse(end_is_leap & end$yday >= 60, end$yday -
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1, end$yday)
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year_frac <- ifelse(start_day < end_day, (end_day -
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start_day)/end_length, ifelse(start_day > end_day,
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(start_length - start_day)/start_length + end_day/end_length,
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0))
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result <- years + year_frac
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}
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else {
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result <- years
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}
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}
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else {
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stop("Unrecognized units. Please choose years, months, or days.")
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}
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return(result)
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}
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