R/mempm25.R

In collin: Visualization the Effects of Collinearity in Distributed Lag Models and Other Linear Models

#' Working memory test scores and air pollution.
#'
#' @description Simulated data for repeated measures of working memory test scores and
#'   residential PM\eqn{_{2.5}} levels in 2,221 children.
#'
#' @format A data frame with 8,884 rows and 17 variables:
#' \describe{
#' \item{id}{individual identifier}
#' \item{session}{test session identifier}
#' \item{school}{chool identifier}
#' \item{sex}{sex of individual}
#' \item{agecen}{age of individual, centered at the mean, in years}
#' \item{educ}{maternal education}
#' \item{resses}{residential neighborhood socioeconomic status indicator}
#' \item{pm25y0}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during pregnancy}
#' \item{pm25y1}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 1}
#' \item{pm25y2}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 2}
#' \item{pm25y3}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 3}
#' \item{pm25y4}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 4}
#' \item{pm25y5}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 5}
#' \item{pm25y6}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 6}
#' \item{pm25y7}{estimated average concentration of PM\eqn{_{2.5}}
#'   (\eqn{\mu}g/m\eqn{^3}) at residence address during year 7}
#' \item{wei}{weight of the observation}
#' \item{wmemo}{working memory test score}
#' }
#'
#' @details This is a synthetic dataset generated with the \code{synthpop} package, based on
#'   a cohort study of children examining the association between PM\eqn{_{2.5}}
#'   concentrations during the prenatal period and the first seven postnatal years on
#'   cognitive tests taken at age 8 (see `References').
#'
#' @source See `References'.
#'
#' @references Rivas I \emph{et al}. Association between Early Life Exposure to Air Pollution and
#'    Working Memory and Attention. \emph{Environmental Health Perspectives}. 2019;127(5):57002.
#'    doi: 10.1289/EHP3169.
#'
#' @examples
#'  # correlation of air pollution levels between two different periods:
#'  pm25yearly <- mempm25[, grep("pm25", names(mempm25))]
#'  print(cor(pm25yearly, use = "complete.obs"), digits = 2)
"mempm25"