Modeling Nonlinearity and Interaction in Regression Analysis Using Spline Variables

By: Roger A. Wojtkiewicz

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Paperback | 14 August 2025

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This volume addresses the issue of linear constraints in regression modeling. Author Roger A. Wojtkiewicz uses the method of knotted spline variables (also known as piecewise linear regression) and a new method involving group spline variables to model nonlinearity in a variety of situations. Using spline variables to model nonlinearity allows researchers to specify unrestricted models for models that involve interval variables, allowing for greater flexibility in modeling any possible interaction.

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