Journal Article

On <i>p</i>-values for smooth components of an extended generalized additive model

Simon N. Wood

in Biometrika

Published on behalf of Biometrika Trust

Volume 100, issue 1, pages 221-228
Published in print March 2013 | ISSN: 0006-3444
Published online October 2012 | e-ISSN: 1464-3510 | DOI: https://dx.doi.org/10.1093/biomet/ass048
On p-values for smooth components of an extended generalized additive model

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The problem of testing smooth components of an extended generalized additive model for equality to zero is considered. Confidence intervals for such components exhibit good across-the-function coverage probabilities if based on the approximate result , where f is the vector of evaluated values for the smooth component of interest and V f is the covariance matrix for f according to the Bayesian view of the smoothing process. Based on this result, a Wald-type test of f=0 is proposed. It is shown that care must be taken in selecting the rank used in the test statistic. The method complements previous work by extending applicability beyond the Gaussian case, while considering tests of zero effect rather than testing the parametric hypothesis given by the null space of the component’s smoothing penalty. The proposed p-values are routine and efficient to compute from a fitted model, without requiring extra model fits or null distribution simulation.

Keywords: Hypothesis test; Model selection; -spline; Semiparametric regression; Spline

Journal Article.  0 words. 

Subjects: Probability and Statistics

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