RTextTools: A Supervised Learning Package for Text Classification. - Timothy P. Jurka; Loren Collingwood; Amber E. Boydstun; Emiliano Grossman; Wouter van Atteveldt (R J., 2013)

eiCompare: Comparing Ecological Inference Estimates across EI and EI: RC. - Loren Collingwood; Kassra Oskooii; Sergio Garcia-Rios; Matt Barreto (R J., 2016)