R/k401k.R

In JustinMShea/wooldRidge: 115 Data Sets from "Introductory Econometrics: A Modern Approach, 7e" by Jeffrey M. Wooldridge

#' k401k
#'
#' Wooldridge Source: L.E. Papke (1995), “Participation in and Contributions to 401(k) Pension Plans:Evidence from Plan Data,” Journal of Human Resources 30, 311-325. Professor Papke kindly provided these data. She gathered them from the Internal Revenue Service’s Form 5500 tapes. Data loads lazily.
#'
#' @section Notes: This data set is used in a variety of ways in the text. One additional possibility is to investigate whether the coefficients from the regression of prate on mrate, log(totemp) differ by whether the plan is a sole plan. The Chow test (see Section 7.4), and the less restrictive version that allows different intercepts, can be used.
#'
#' Used in Text: pages 63, 79, 136, 174, 219, 692
#'
#' @docType data
#'
#' @usage data('k401k')
#'
#' @format A data.frame with 1534 observations on 8 variables:
#' \itemize{
#'  \item \strong{prate:} participation rate, percent
#'  \item \strong{mrate:} 401k plan match rate
#'  \item \strong{totpart:} total 401k participants
#'  \item \strong{totelg:} total eligible for 401k plan
#'  \item \strong{age:} age of 401k plan
#'  \item \strong{totemp:} total number of firm employees
#'  \item \strong{sole:} = 1 if 401k is firm's sole plan
#'  \item \strong{ltotemp:} log of totemp
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples  str(k401k)
"k401k"