Homework 3	Stat 640    January 27, 2009    D. Scott

	 Due Tuesday     February 3



1.  Problem 3.5 in book (just ridge portion)


2.  Consider the digits  1, 4, 7, and 8  in zip.train.
    Project the data onto the first two principal
    components of

        a. all the data for the four digits (n = 2,844)

	b.  the four (4!) means vectors (one for each digit)

    Comment on which is "better", how much, and why.