3 Dimension Reduction and Its Applications
3.1 Introduction
3.2 Average Outer Product of Gradients and its Estimation
3.2.1 The Simple Case
3.2.2 The Varying-coefficient Model
3.3 A Unified Estimation Method
3.4 Number of E.D.R. Directions
3.5 The Algorithm
3.6 Simulation Results
3.7 Applications
3.8 Conclusions and Further Discussion
3.9 Appendix. Assumptions and Remarks
Bibliography