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42 lines
1.7 KiB
R
42 lines
1.7 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), will be coerced with \code{\link{as.POSIXlt}}}
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\item{reference}{reference date(s) (defaults to today), will be coerced with \code{\link{as.POSIXlt}} and cannot be lower than \code{x}}
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\item{exact}{a 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 a year of \code{reference} (either 365 or 366).}
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\item{na.rm}{a logical to indicate whether missing values should be removed}
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}
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\value{
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An integer (no decimals) if \code{exact = FALSE}, a 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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\section{Read more on our website!}{
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On our website \url{https://msberends.gitlab.io/AMR} you can find \href{https://msberends.gitlab.io/AMR/articles/AMR.html}{a tutorial} about how to conduct AMR analysis, the \href{https://msberends.gitlab.io/AMR/reference}{complete documentation of all functions} (which reads a lot easier than here in R) and \href{https://msberends.gitlab.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}} function.
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}
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