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#' Wages Data from the National Longitudinal Survey of Youth (NLSY79)
#'
#' A data set contains longitudinal data of mean hourly wages along with several
#' demographic variables of Americans from the National Longitudinal Survey of Youth
#' (NLSY79) held by the U.S. Bureau of Labor Statistics from Round 1 (1979 survey year)
#' to Round 28 (2018 survey year). The cohort provided in this data set is
#' the highest grade completed, up to 12th grade, and participated in
#' at least five rounds of surveys.
#'
#' @source The U.S. Bureau of Labor Statistics. (2021, January 6). *National Longitudinal Survey of Youth 1979*. https://www.nlsinfo.org/content/cohorts/nlsy79/get-data
#'
#' @format A tsibble with 103,994 rows and 15 variables:
#' \describe{
#' \item{id}{A unique individual's ID number. This is the `key` of the data.}
#' \item{year}{The year the observation was taken. This could be the `index` of the data.}
#' \item{wage}{The mean of the hourly wages the individual gets at
#' each of their different jobs. The value could be a
#' weighted or an arithmetic mean. The weighted mean is used
#' when the information of hours of work as the weight
#' is available. The mean hourly wage could also be a predicted
#' value if the original value is considered influential
#' by the robust linear regression as part of data cleaning.}
#' \item{age_1979}{The age of the subject in 1979.}
#' \item{gender}{Gender of the subject, FEMALE and MALE.}
#' \item{race}{Race of the subject, NON-BLACK,NON-HISPANIC; HISPANIC; BLACK.}
#' \item{hgc}{Highest grade completed.}
#' \item{hgc_i}{Integer of highest grade completed.}
#' \item{yr_hgc}{The year when the highest grade completed.}
#' \item{njobs}{Number of jobs that an individual has.}
#' \item{hours}{The total number of hours the individual usually works per week.}
#' \item{is_wm}{Whether the mean hourly wage is weighted mean, using the hour work
#' as the weight, or regular/arithmetic mean. TRUE = is weighted mean.
#' FALSE = is regular mean.}
#' \item{is_pred}{Whether the mean hourly wage is a predicted value or not.}
#' }
#'
#' @examples
#' # data summary
#' wages
#'
#' library(ggplot2)
#' library(dplyr)
#' library(tsibble)
#' wages_ids <- key_data(wages) %>% select(id)
#' wages %>%
#' dplyr::filter(id %in% sample_n(wages_ids, 10)$id) %>%
#' ggplot() +
#' geom_line(aes(x = year,
#' y = wage,
#' group = id), alpha = 0.8)
#' @docType data
#' @name wages
#' @import tsibble
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