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#' NRC Sentiment Polarity Table
#'
#' A \pkg{data.table} dataset containing a filtered version of Mohammad &
#' Turney', P. D.'s (2010) positive/negative word list as sentiment lookup values.
#'
#' @details
#' \itemize{
#' \item x. Words
#' \item y. Sentiment values (+1, -1)
#' }
#'
#' @section License: The original authors note the data is available for
#' non-commercial use: "If interested in commercial use of any of these lexicons,
#' send email to Saif M. Mohammad (Senior Research Officer at NRC and creator of
#' these lexicons): saif.mohammad@@nrc-cnrc.gc.ca and Pierre Charron (Client
#' Relationship Leader at NRC): Pierre.Charron@@nrc-cnrc.gc.ca. A nominal
#' one-time licensing fee may apply."
#' @docType data
#' @keywords datasets
#' @name hash_sentiment_nrc
#' @usage data(hash_sentiment_nrc)
#' @format A data frame with 5468 rows and 2 variables
#' @references http://www.purl.com/net/lexicons \cr \cr
#' Mohammad, S. M. & Turney, P. D. (2010) Emotions evoked by common words and
#' phrases: Using Mechanical Turk to create an emotion lexicon, In Proceeding of
#' Workshop on Computational Approaches to Analysis and Generation of Emotion in
#' Text, 26-34.
#' @examples
#' \dontrun{
#' library(data.table)
#' hash_sentiment_nrc[c('happy', 'angry')]
#' }
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