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57 lines
2.8 KiB
R
57 lines
2.8 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 sytem 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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\section{Stable Lifecycle}{
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\if{html}{\figure{lifecycle_stable.svg}{options: style=margin-bottom:"5"} \cr}
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The \link[=lifecycle]{lifecycle} of this function is \strong{stable}. In a stable function, major changes are unlikely. This means that the unlying code will generally evolve by adding new arguments; removing arguments or changing the meaning of existing arguments will be avoided.
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If the unlying code needs breaking changes, they will occur gradually. For example, an argument will be deprecated and first continue to work, but will emit a message informing you of the change. Next, typically after at least one newly released version on CRAN, the message will be transformed to an error.
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}
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\section{Read more on Our Website!}{
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On our website \url{https://msberends.github.io/AMR/} you can find \href{https://msberends.github.io/AMR/articles/AMR.html}{a comprehensive tutorial} about how to conduct AMR data analysis, the \href{https://msberends.github.io/AMR/reference/}{complete documentation of all functions} and \href{https://msberends.github.io/AMR/articles/WHONET.html}{an example analysis using WHONET data}.
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}
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\examples{
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# 10 random birth dates
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df <- data.frame(birth_date = Sys.Date() - 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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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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