#' @title Covariate data frame for the Alabama voter turnout data
#'
#' @description This data.frame includes logarithmized data on population casting votes, of the
#' population that is 25 years and older who completed 12th grade or higher
#' education, on the number of owner-occupied housing units, and of aggregate
#' income per county in Alabama, US. This data.frame can be specified as covariate
#' matrix in the network autocorrelation model to predict the voter turnout in
#' Alabama.
#'
#' \tabular{lll}{
#' \strong{pop_eligible} \tab \code{numeric} \tab Logarithm of the population casting votes \cr
#' \strong{pop_college} \tab \code{numeric} \tab Logarithm of the population that is 25 years and older who completed 12th grade or higher education \cr
#' \strong{homeownership} \tab \code{numeric} \tab Logarithm of the number of owner-occupied housing units \cr
#' \strong{income} \tab \code{numeric} \tab Logarithmized aggregate income per county \cr
#' }
#' @docType data
#' @keywords datasets
#' @name X_votes
#' @usage data(X_votes)
#' @references Pace, R. K. and R. Barry. 1997. Quick Computation of
#' Spatial Autoregressive Estimators. Geographical Analysis, 29, 232-47.
#' Data can be downloaded from
#' http://www.spatial-econometrics.com/html/jplv7.zip
#' @format A data.frame with 67 rows and 4 columns
##
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