//R
//R/tf_idf.R
//R/get_terms.R
//R/get_words.R
//R/top_terms.R
//R/text_nowcast.R
//R/text_forecast.R
//R/tv_dictionary.R
//R/optimal_alphas.R
//R/optimal_factor.R
//R/get_collocations.R
//R/hard_thresholding.R
//R/tv_sentiment_index.R
//R/tv_sentiment_index_all_coefs.R