“…Alternative approaches to feature selection common in finance and accounting tend to use significantly larger sets of features (e.g., measures of the presence or absence of individual words as in Antweiler and Frank, 2004, Li, 2010, Balakrishnan et al, 2010 or significantly fewer features (e.g., Loughran and McDonald, 2011, propose the six alternative single-feature measures of the "tone" of 10-K filings using the proportion of words falling into specific categories, namely, positive tone, negative tone, uncertainty, litigious, strong modal words, and weak modal words).…”