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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 , 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 language | English |
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Pages (from-to) | 221-228 |
Number of pages | 8 |
Journal | Biometrika |
Volume | 100 |
Issue number | 1 |
DOIs | |
Publication status | Published - Mar 2013 |
Keywords
- Hypothesis test
- Model selection
- -spline
- Semiparametric regression
- Spline
- BAYESIAN CONFIDENCE-INTERVALS
- NORMAL VARIABLES
- QUADRATIC-FORMS
- SPLINE MODELS
- MIXED MODELS
- HYPOTHESIS
- TESTS
- LIKELIHOOD
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Dive into the research topics of 'On p-values for smooth components of an extended generalized additive model'. Together they form a unique fingerprint.Projects
- 1 Finished
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National Centre for Statistical Ecology: National Centre for Statistical Ecology
Buckland, S. T. (PI)
1/10/10 → 30/09/15
Project: Standard