econpanel: Economic experts panel survey data

#' Initiative on Global Markets expert panel survey results
#' 
#' Likert votes by 50 economists on several years' worth of policy surveys 
#' conducted by the Initiative on Global Markets at the University of Chicago's 
#' Booth School of Business
#' 
#' @format Data frame.
#' @source IGM Forum \url{http://www.igmchicago.org/igm-economic-experts-panel}
#' @name igm
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#' Initiative on Global Markets European expert panel survey results
#' 
#' European counterpart to \code{\link{igm}}
#' 
#' @format Data frame.
#' @source IGM Forum
#'   \url{http://www.igmchicago.org/european-economic-experts-panel}
#' @name eigm
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#' Centre for Macroeconomics expert panel survey results
#' 
#' Likert votes by 58 economists on several years' worth of policy surveys 
#' conducted by the Centre for Macroeconomics
#' 
#' @format Data frame.
#' @source The CFM Surveys \url{http://cfmsurvey.org/}
#' @name cfm
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#' Planet Money presidential primary proposals assessment
#' 
#' Frequency dataset of likert votes by 22 economists of several candidates' 
#' policy proposals in a survey conducted by NPR's Planet Money team during the 
#' 2015-6 presidential primary season
#' 
#' @format Data frame.
#' @source Jess Jiang, "Economists On Candidates' Proposals: Mostly Bad". Planet
#'   Money, 26 February 2016 
#'   \url{http://www.npr.org/sections/money/2016/02/26/468298576/economists-on-candidates-proposals-mostly-bad}
#' @name planetmoney
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