Transformation and SIR.
 We will discuss

1. Why SIR can  reveal various patterns like blurring curves,
      clusters, heteroscedasticty?

2. Relationship with multiple linear regression,  additive model, ACE, and
      projection pursuit regression

NOTE :  additive model,  ACE and projection pursuit  are implemented in S+.

Today's pdf files.

Note : Supplemental pdf files ( population ANOVA identity; condtion mean E(x| b'x) )
for Monday's lecture is now available; revist Moday's page.