#' Responses from 1983 American National Election Survey Pilot
#'
#' \code{ANES} contains political ideology survey data from the 1983 American National Election Survey Pilot. Respondents were read a value statement and asked
#' to report their level of agreement: `strongly agree', `agree', `can't decide', `disagree', and strongly disagree'.
#' The 279 complete responses to the 19 statements selected by Feldman (1988)
#' and reanalyzed by Gross and Manrique-Vallier (2014) are included. `Strongly disagree' and `disagree' as well
#' as `strongly agree' and `agree` have been collapsed into single categories.
#' 0 indicates `agree', 1 indicates `can't decide', and 2
#' indicates `disagree'. The statements have been grouped into 3 overarching themes as
#' indicated in the variable names- Equality (EQ), Economic Individualism (IND), and Free Enterprise (ENT).
#' Variable ID's from the original ANES questionnaire are included in parentheses.
#' An example analysis of the data is included in the
#' "Fitting Mixed Membership Models Using \code{mixedMem}" vignette.
#'
#' @name ANES
#' @docType data
#' @usage data(ANES)
#' @format A data frame with 279 individuals and 19 variables:
#' \describe{
#' \item{EQ1}{If people were treated more equally in this country,
#' we would have many fewer problems (V832169)}
#' \item{EQ2}{We should give up on the goal of equality, since people
#' are so different to begin with (V832172)}
#' \item{EQ3}{Our society should do whatever is necessary to make sure
#' that everyone has an equal opportunity to succeed (V832175)}
#' \item{EQ4}{Some people are just better cut out than others for important
#' positions in society (V832178)}
#' \item{EQ5}{Some people are better at running things and should be allowed
#' to do so (V832250)}
#' \item{EQ6}{All kinds of people should have an equal say in running
#' this country, not just those who are successful (V832253)}
#' \item{EQ7}{One of the big problems in this country is that we don`t
#' give everyone an equal chance (V832256)}
#' \item{IND1}{Any person who is willing to work hard has a good chance
#' of succeeding (V832170)}
#' \item{IND2}{Hard work offers little guarantee of success (V832173)}
#' \item{IND3}{Most people who don`t get ahead should not blame
#' the system; they really have only themselves to blame (V832176)}
#' \item{IND4}{Even if people are ambitious, they often cannot succeed (V832251)}
#' \item{IND5}{If people work hard, they almost always get what they want (V832254)}
#' \item{IND6}{Even if people try hard, they often cannot reach their goals (V832257)}
#' \item{ENT1}{The less government gets involved with business and the
#' economy, the better off this country will be (V832171)}
#' \item{ENT2}{There are many goods and services that would never be
#' available to ordinary people without governmental intervention (V832174)}
#' \item{ENT3}{There should be no government interference with business
#' and trade (V832177)}
#' \item{ENT4}{Putting government regulations on business does not
#' endanger personal freedom (V832252)}
#' \item{ENT5}{Government intervention leads to too much red tape and
#' too many problems (V832255)}
#' \item{ENT6}{Contrary to what some people think, a free enterprise
#' system is not necessary for our form of government to survive (V832258)}
#' }
#' @references
#' Feldman, Stanley. "Structure and consistency in public opinion: The role of core beliefs and values." American Journal of Political Science (1988): 416-440.
#'
#' Gross, J.H. and Manrique-Vallier, D. "A Mixed-Membership Approach to the Assessment of Political Ideology from Survey Responses."
#' in Airoldi, E. M., Blei, D. M., Erosheva, E. A., and Fienberg, S. E.
#' Handbook of Mixed Membership Models and Its Applications. Chapman & Hall/CRC, 2014
#'
#' National Election Studies, 1983 Pilot Election Study. Ann Arbor, MI: University of Michigan, Center for Political Studies, 1999
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