On p-values for smooth components of an extended generalized additive model

Simon N Wood

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)
286 Downloads (Pure)

Abstract

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 \hat f(i) ~ N{f(i),V_f(i,i)}, 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.
Original languageEnglish
Pages (from-to)221-228
Number of pages8
JournalBiometrika
Volume100
Issue number1
Early online date19 Oct 2012
DOIs
Publication statusPublished - Mar 2013

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