Bivariate Function Extensions

  • Jaroslaw Harezlak
  • David Ruppert
  • Matt P. Wand
Part of the Use R! book series (USE R)


We now focus on models for the joint effect of two continuous predictor variables. Additive models are convenient, but there is no reason to assume that they are always adequate. In the general bivariate models studied in this chapter, the joint effect of the two variables is a smooth, but otherwise unrestricted, function of these variables. Therefore, these models allow interactions so that the effect of one predictor depends upon the value of the other predictor.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Jaroslaw Harezlak
    • 1
  • David Ruppert
    • 2
  • Matt P. Wand
    • 3
  1. 1.School of Public HealthIndiana University BloomingtonBloomingtonUSA
  2. 2.Department of Statistical ScienceCornell UniversityIthacaUSA
  3. 3.School of Mathematical and Physical SciencesUniversity of Technology SydneyUltimoAustralia

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