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Penalized nonparametric scalar-on-function regression via principal coordinates

Research output: Contribution to journalArticle


Philip T. Reiss, David L. Miller, Pei Shien Wu, Wen Yu Hua

School/Research organisations


A number of classical approaches to nonparametric regression have recently been extended to the case of functional predictors. This article introduces a new method of this type, which extends intermediate-rank penalized smoothing to scalar-on-function regression. In the proposed method, which we call principal coordinate ridge regression, one regresses the response on leading principal coordinates defined by a relevant distance among the functional predictors, while applying a ridge penalty. Our publicly available implementation, based on generalized additive modeling software, allows for fast optimal tuning parameter selection and for extensions to multiple functional predictors, exponential family-valued responses, and mixed-effects models. In an application to signature verification data, principal coordinate ridge regression, with dynamic time warping distance used to define the principal coordinates, is shown to outperform a functional generalized linear model. Supplementary materials for this article are available online.



Original languageEnglish
Pages (from-to)569-587
Number of pages10
JournalJournal of Computational and Graphical Statistics
Issue number3
Early online date2 Aug 2016
StatePublished - 2017

    Research areas

  • Dynamic time warping, Functional regression, Generalized additive model, Kernel ridge regression, Multidimensional scaling

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