Does it have a relation to principal components and / or eigenvalues? Hilbert spaces and projections in Hilbert spaces?
Do you have some good references better than a simple search?
"Latent Symantic Indexing and Term Vectoring"
Which technique does
http://www.nedstatbasic.net/
Use?
Good to uncover surfers habits as an alternative to KW popularity.
Kjell Gunnar Bleivik
http://www.multifinanceit.com
http://www.blognorway.com