Function Words in Authorship Attribution. From Black Magic to Theory?

This position paper focuses on the use of function words in computational authorship attribution. Although recently there have been multiple successful applications of authorship attribution, the field is not particularly good at the explication of methods and theoretical issues, which might eventually compromise the acceptance of new research results in the traditional humanities community. I wish to partially help remedy this lack of explication and theory, by contributing a theoretical discussion on the use of function words in stylometry. I will concisely survey the attractiveness of function words in stylometry and relate them to the use of character n-grams. At the end of this paper, I will propose to replace the term 'function word' by the term 'functor' in stylometry, due to multiple theoretical considerations.