#' prison
#'
#' Wooldridge Source: S.D. Levitt (1996), “The Effect of Prison Population Size on Crime Rates: Evidence from Prison Overcrowding Legislation,” Quarterly Journal of Economics 111, 319-351. Professor Levitt kindly provided me with the data, of which I used a subset. Data loads lazily.
#'
#' @section
#'
#' Used in Text: pages 573-574
#'
#' @docType data
#'
#' @usage data('prison')
#'
#' @format A data.frame with 714 observations on 45 variables:
#' \itemize{
#' \item \strong{state:} alphabetical; DC = 9
#' \item \strong{year:} 80 to 93
#' \item \strong{govelec:} =1 if gubernatorial election
#' \item \strong{black:} proportion black
#' \item \strong{metro:} proportion in metro. areas
#' \item \strong{unem:} proportion unemployed
#' \item \strong{criv:} viol. crimes per 100,000
#' \item \strong{crip:} prop. crimes per 100,000
#' \item \strong{lcriv:} log(criv)
#' \item \strong{lcrip:} log(crip)
#' \item \strong{gcriv:} lcriv - lcriv_1
#' \item \strong{gcrip:} lcrip - lcrip_1
#' \item \strong{y81:} =1 if year == 81
#' \item \strong{y82:}
#' \item \strong{y83:}
#' \item \strong{y84:}
#' \item \strong{y85:}
#' \item \strong{y86:}
#' \item \strong{y87:}
#' \item \strong{y88:}
#' \item \strong{y89:}
#' \item \strong{y90:}
#' \item \strong{y91:}
#' \item \strong{y92:}
#' \item \strong{y93:}
#' \item \strong{ag0_14:} prop. pop. 0 to 14 yrs
#' \item \strong{ag15_17:} prop. pop. 15 to 17 yrs
#' \item \strong{ag18_24:} prop. pop. 18 to 24 yrs
#' \item \strong{ag25_34:} prop. pop. 25 to 34 yrs
#' \item \strong{incpc:} per capita income, nominal
#' \item \strong{polpc:} police per 100,000 residents
#' \item \strong{gincpc:} log(incpc) - log(incpc_1)
#' \item \strong{gpolpc:} lpolpc - lpolpc_1
#' \item \strong{cag0_14:} change in ag0_14
#' \item \strong{cag15_17:} change in ag15_17
#' \item \strong{cag18_24:} change in ag18_24
#' \item \strong{cag25_34:} change in ag25_34
#' \item \strong{cunem:} change in unem
#' \item \strong{cblack:} change in black
#' \item \strong{cmetro:} change in metro
#' \item \strong{pris:} prison pop. per 100,000
#' \item \strong{lpris:} log(pris)
#' \item \strong{gpris:} lpris - lpris[_n-1]
#' \item \strong{final1:} =1 if fnl dec on litig, curr yr
#' \item \strong{final2:} =1 if dec on litig, prev 2 yrs
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples str(prison)
"prison"
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