> The name of PCA does make it sound like you are selecting dimensions. I certainly thought that! Using somes terms from the previous comment, does this mean

> The name of PCA does make it sound like you are selecting dimensions. I certainly thought that! Using somes terms from the previous comment, does this mean that the k < N subspace is not (necessarily) a subset of the N-space? Or is the subspace a subset of the data with a different coordinate system? (Yes, I'm still trying to intuitively grasp these ideas.)