No wonder that your first reply reminded me of PCA.
May I ask what kind of data you use PCA for?
gets more popular these days. I have seen it used for genetic
chimera analysis and DNA arrays as a prelude to clustering.
When I started to use it, my mentor was very sceptic about
how acceptable it would be. While the statistican who helps
me told me it was a technique of about a century old so
nobody should complain.
Anyway, I use it for clustering analysis as well, but than
for extracellularly recorded neuronal spike waveforms. So
I sample spike waveforms from an electrode that was placed in
a brain slice and turn a PCA routine loose on it. Mostly just
the first two components are enough to get your clusters.
"We are not alone"(FZ)