In theory, there are the same number of principal components as there are variables, but in practice, usually only a few of the principal components need to be identified to account for most of the data variance.

O Mother Earth, O Sun that makest clean, What poison have I heard, what speechless sin !

Hmmm […] Is it just me or what, but reading the subject-line on this post i expected something very kinky? You’ve let me down, Per(vert). I’m sorry, VoltAire stole all my midgetporn.

You have very much honested my lodging with your presence.