To add yet another option to the list, you may want to check out COALS,
which is a co-occurrence vector based system similar to LSA which I
developed while at CMU and MIT. The following web page has a paper
explaining the model and giving performance comparisons with other
methods, and also allows you to download pre-computed vectors.
http://dlt4.mit.edu/~dr/COALS/ <http://dlt4.mit.edu/%7Edr/COALS/>
Doug
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