I have a thing for dimensionality reduction.  One method in particular, the Self organizing map, is probably my favorite.  I made this tutorial for my lab, but I thought it would be useful to share with the world of the internet! Click on the presentation, and then use your cursor to move through the slides.  Here you can also see the presentation in a new window, or download a PDF. <iframe class="iframe-class" frameborder="0" height="650" scrolling="yes" src="http://vbmis.com/bmi/diabolical/SOM.html" width="100%"></iframe>