Abstract
In this work we propose the use of mutual information to measure the predictive potential of principal components in regression. We show that this criterion produces the same results as previous works which used the correlation to measure the strength of the relationship between the response variable with the extracted principal components in Gaussian settings. We demonstrate this in the linear regression model and also beyond that, in the conditional mean model and the conditional independence model, two common choices in sufficient dimension reduction, achieving a connection between unsupervised and supervised dimension reduction methods.
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Acknowledgements
The author would like to thank the editors and two anonymous reviewers for their comments. I would also like to thank Prof. Bing Li for an insightful discussion a few years back. Finally, special thanks to Prof. R. D. Cook for his contributions and his kindness. Back in time, I was still a PhD student, and after publishing the first paper on this topic (Artemiou and Li (2009)—my MSc thesis paper), I met him for the first time in the summer of 2009 at the JSM conference in Washington DC. When I introduced myself, his immediate reaction was “The principal component guy.” It stuck with me since then and anytime I talk about principal components, his reaction comes to mind. It is that reaction that convinced me to contribute something on the predictive potential of PCA for this edition. I also want to thank him because, although he was surrounded by a number of his students and collaborators, he took a couple of steps away from them and a couple of minutes to discuss with me. I found it very kind of him.
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Artemiou, A. (2021). Using Mutual Information to Measure the Predictive Power of Principal Components. In: Bura, E., Li, B. (eds) Festschrift in Honor of R. Dennis Cook. Springer, Cham. https://doi.org/10.1007/978-3-030-69009-0_1
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DOI: https://doi.org/10.1007/978-3-030-69009-0_1
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