“itdr” is a system for estimating a basis of the central and central mean subspaces in regression by using integral transformation methods. This “vignette” demonstrate the usage of functions in itdr package over “automobile” and “PDB” datasets.

Chapter 1: Installation

1.1: Install itdr package

Installation can be done for itdr R package in three ways.


The codes for the Fourier transformation and the convolution transformation methods are adapted from the codes provided by Zhu and Zeng (2006). Moreover, those for the elliptically contoured distributed variables and the kernel density estimation methods are essentially a modification of the program provided by Zeng and Zhu (2010). The code for Fourier transforms approach for the inverse dimension reduction method is adapted from the code provided by Weng and Yin (2018).