possible LLA implementation

[jseale-asapp]

In 'An Evaluation and Comparison of Linguistic Alignment Measures', Xu and Reitter (2015) evaluate Spearman's correlation coefficient, LLA, and RepDecay. They report LLA has the best performance with respect to normality and sensitivity, and 'yields more significant between-individual differences and has better within-individual stability'. It would be interesting to repeat the experiments with cosine similarity, and see how it compares to LLA. If the two exhibit complementary advantages, it may be interesting to incorporate an LLA implementation.