The authors in (Baayen, 2001;Khmaladze and Chitashvili, 1989;Wagner et al., 2006) propose a natural scaling formulation to study this problem; specifically, (Baayen, 2001) has a tutorial-like summary of the theoretical work in (Khmaladze, 1987;Khmaladze and Chitashvili, 1989).
in particular, the authors consider a sequence of vocabulary sets and probability distributions, indexed by the observation size n. the observation (X 1 , .