#' @importFrom tibble tibble
NULL
#' Democracy and Economic Development (Around) 1949-50
#'
#' A data set on democracy and economic development for 48 countries that Lipset
#' (1959) first described.
#'
#' @format A data frame with 48 observations on the following 11 variables.
#' \describe{
#' \item{\code{country}}{a character country for an English country name}
#' \item{\code{cat}}{a category for the country by their region and level of democracy}
#' \item{\code{iso3c}}{a three-character ISO code}
#' \item{\code{wbgdp2011est}}{an estimated gross domestic product in 2011 USD}
#' \item{\code{wbpopest}}{an estimated population size}
#' \item{\code{unpop}}{a population size (in thousands)}
#' \item{\code{uninc}}{a national income (in millions)}
#' \item{\code{unincpc}}{a national income per capita}
#' \item{\code{xm_qudsest}}{a "Quick UDS" estimate of democracy on a latent scale (see details)}
#' \item{\code{v2x_polyarchy}}{the Varieties of Democracy "polyarchy" estimate (see details)}
#' \item{\code{polity2}}{the \code{polity2} score from the Polity project (see details)}
#' }
#'
#' @details
#'
#' The three variables with the prefix of \code{un} nominally come from the
#' United Nations Statistical Division for 1949/1950, but are actually retrieved
#' from Andic and Peacock (1961). Andic and Peacock (1961) note you should be
#' skeptical of Soviet-style calculations of national income and thus don't
#' include it in the data they make available.
#'
#' Anything else is explicitly benchmarked to 1950 as a referent year. The GDP
#' and population estimates come by way of Anders et al. (2020). You can manually
#' create your own GDP per capita variable here because the GDP is demarcated
#' in dollars and the population size is in units of 1. Take one and divide it
#' over the other.
#'
#' The democracy variables are all unique in their own way. The "Quick UDS"
#' estimates are generated to be latent and, globally, have a mean that
#' approximates 0 and a standard deviation that approximates 1. In the regression
#' context, that would mean a coefficient would communicate something like a
#' magnitude change across a standard deviation on the scale. The "polyarchy"
#' estimate has a theoretical minimum of 0 and a theoretical maximum of 1. In
#' the regression context, that would mean a coefficient communicates a min/max
#' effect. The Polity project estimate comes from a usual scale of -10 to 10 and
#' a regression coefficient communicates something much less exotic. It's a unit
#' change on this scale.
#'
#' In all cases, higher values of democracy = more "democraticness", for lack
#' of a better term.
#'
#' @references
#'
#'
#' Anders, Therese, Christopher J. Fariss, and Jonathan N. Markowitz. 2020.
#' "Bread Before Guns or Butter: Introducing Surplus Domestic Product (SDP)"
#' \emph{International Studies Quarterly} 64(2): 392--405.
#'
#'
#' Andic, Suphan and Alan T. Peacock. 1961. "The International Distribution of
#' Income, 1949 and 1957." *Journal of the Royal Statistical Society*. Series A
#' (General) 124(2): 206-218.
#'
#' Coppedge, Michael, John Gerring, Carl Henrik Knutsen, Staffan I. Lindberg,
#' Jan Teorell, David Altman, Michael Bernhard, M. Steven Fish, Adam Glynn,
#' Allen Hicken, Anna Luhrmann, Kyle L. Marquardt, Kelly McMann, Pamela
#' Paxton, Daniel Pemstein, Brigitte Seim, Rachel Sigman, Svend-Erik
#' Skaaning, Jeffrey Staton, Agnes Cornell, Lisa Gastaldi, Haakon Gjerlow,
#' Valeriya Mechkova, Johannes von Romer, Aksel Sundtrom, Eitan Tzelgov,
#' Luca Uberti, Yi-ting Wang, Tore Wig, and Daniel Ziblatt. 2020.
#' "V-Dem Codebook v10" Varieties of Democracy (V-Dem) Project.
#'
#' Lipset, Seymour Martin. 1959. "Some Social Requisites of Democracy:
#' Economic Development and Political Legitimacy" *American Political Science
#' Review* 53(1): 69-105.
#'
#' Marshall, Monty G., Ted Robert Gurr, and Keith Jaggers. 2017.
#' "Polity IV Project: Political Regime Characteristics and Transitions,
#' 1800-2017." Center for Systemic Peace.
#'
#' Marquez, Xavier, "A Quick Method for Extending the Unified Democracy
#' Scores" (March 23, 2016). \doi{10.2139/ssrn.2753830}
#'
#' Pemstein, Daniel, Stephen Meserve, and James Melton. 2010. "Democratic
#' Compromise: A Latent Variable Analysis of Ten Measures of Regime Type."
#' *Political Analysis* 18(4): 426-449.
#'
#'
"Lipset59"
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