#' gpa3
#'
#' Wooldridge Source: See GPA2.RAW Data loads lazily.
#'
#' @section
#'
#' Used in Text: pages 246-248, 273, 297-298, 478
#'
#' @docType data
#'
#' @usage data('gpa3')
#'
#' @format A data.frame with 732 observations on 23 variables:
#' \itemize{
#' \item \strong{term:} fall = 1, spring = 2
#' \item \strong{sat:} SAT score
#' \item \strong{tothrs:} total hours prior to term
#' \item \strong{cumgpa:} cumulative GPA
#' \item \strong{season:} =1 if in season
#' \item \strong{frstsem:} =1 if student's 1st semester
#' \item \strong{crsgpa:} weighted course GPA
#' \item \strong{verbmath:} verbal SAT to math SAT ratio
#' \item \strong{trmgpa:} term GPA
#' \item \strong{hssize:} size h.s. grad. class
#' \item \strong{hsrank:} rank in h.s. class
#' \item \strong{id:} student identifier
#' \item \strong{spring:} =1 if spring term
#' \item \strong{female:} =1 if female
#' \item \strong{black:} =1 if black
#' \item \strong{white:} =1 if white
#' \item \strong{ctrmgpa:} change in trmgpa
#' \item \strong{ctothrs:} change in total hours
#' \item \strong{ccrsgpa:} change in crsgpa
#' \item \strong{ccrspop:} change in crspop
#' \item \strong{cseason:} change in season
#' \item \strong{hsperc:} percentile in h.s.
#' \item \strong{football:} =1 if football player
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples str(gpa3)
"gpa3"
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