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49 lines
1.8 KiB
R
49 lines
1.8 KiB
R
% Generated by roxygen2: do not edit by hand
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% Please edit documentation in R/age.R
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\name{age}
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\alias{age}
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\title{Age in Years of Individuals}
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\usage{
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age(x, reference = Sys.Date(), exact = FALSE, na.rm = FALSE, ...)
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}
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\arguments{
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\item{x}{date(s), \link{character} (vectors) will be coerced with \code{\link[=as.POSIXlt]{as.POSIXlt()}}}
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\item{reference}{reference date(s) (defaults to today), \link{character} (vectors) will be coerced with \code{\link[=as.POSIXlt]{as.POSIXlt()}}}
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\item{exact}{a \link{logical} to indicate whether age calculation should be exact, i.e. with decimals. It divides the number of days of \href{https://en.wikipedia.org/wiki/Year-to-date}{year-to-date} (YTD) of \code{x} by the number of days in the year of \code{reference} (either 365 or 366).}
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\item{na.rm}{a \link{logical} to indicate whether missing values should be removed}
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\item{...}{arguments passed on to \code{\link[=as.POSIXlt]{as.POSIXlt()}}, such as \code{origin}}
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}
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\value{
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An \link{integer} (no decimals) if \code{exact = FALSE}, a \link{double} (with decimals) otherwise
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}
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\description{
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Calculates age in years based on a reference date, which is the system date at default.
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}
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\details{
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Ages below 0 will be returned as \code{NA} with a warning. Ages above 120 will only give a warning.
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This function vectorises over both \code{x} and \code{reference}, meaning that either can have a length of 1 while the other argument has a larger length.
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}
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\examples{
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# 10 random pre-Y2K birth dates
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df <- data.frame(birth_date = as.Date("2000-01-01") - runif(10) * 25000)
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# add ages
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df$age <- age(df$birth_date)
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# add exact ages
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df$age_exact <- age(df$birth_date, exact = TRUE)
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# add age at millenium switch
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df$age_at_y2k <- age(df$birth_date, "2000-01-01")
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df
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}
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\seealso{
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To split ages into groups, use the \code{\link[=age_groups]{age_groups()}} function.
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}
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