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#' gpa1
#'
#' Wooldridge Source: Christopher Lemmon, a former MSU undergraduate, collected these data from a survey he took of MSU students in Fall 1994. Data loads lazily.
#'
#' @section Notes: This is a nice example of how students can obtain an original data set by focusing locally and carefully composing a survey.
#'
#' Used in Text: pages 75, 77, 81, 129-130, 160, 232, 262, 295-296, 300-301
#'
#' @docType data
#'
#' @usage data('gpa1')
#'
#' @format A data.frame with 141 observations on 29 variables:
#' \itemize{
#' \item \strong{age:} in years
#' \item \strong{soph:} =1 if sophomore
#' \item \strong{junior:} =1 if junior
#' \item \strong{senior:} =1 if senior
#' \item \strong{senior5:} =1 if fifth year senior
#' \item \strong{male:} =1 if male
#' \item \strong{campus:} =1 if live on campus
#' \item \strong{business:} =1 if business major
#' \item \strong{engineer:} =1 if engineering major
#' \item \strong{colGPA:} MSU GPA
#' \item \strong{hsGPA:} high school GPA
#' \item \strong{ACT:} 'achievement' score
#' \item \strong{job19:} =1 if job <= 19 hours
#' \item \strong{job20:} =1 if job >= 20 hours
#' \item \strong{drive:} =1 if drive to campus
#' \item \strong{bike:} =1 if bicycle to campus
#' \item \strong{walk:} =1 if walk to campus
#' \item \strong{voluntr:} =1 if do volunteer work
#' \item \strong{PC:} =1 of pers computer at sch
#' \item \strong{greek:} =1 if fraternity or sorority
#' \item \strong{car:} =1 if own car
#' \item \strong{siblings:} =1 if have siblings
#' \item \strong{bgfriend:} =1 if boy- or girlfriend
#' \item \strong{clubs:} =1 if belong to MSU club
#' \item \strong{skipped:} avg lectures missed per week
#' \item \strong{alcohol:} avg # days per week drink alc.
#' \item \strong{gradMI:} =1 if Michigan high school
#' \item \strong{fathcoll:} =1 if father college grad
#' \item \strong{mothcoll:} =1 if mother college grad
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples str(gpa1)
"gpa1"
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