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


Reference:

Wood, S. N., 2013. On p-values for smooth components of an extended generalized additive model. Biometrika, 100 (1), pp. 221-228.

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    Official URL:

    http://dx.doi.org/10.1093/biomet/ass048

    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.

    Details

    Item Type Articles
    CreatorsWood, S. N.
    DOI10.1093/biomet/ass048
    DepartmentsFaculty of Science > Mathematical Sciences
    Publisher Statementspv3.pdf: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Biometrika following peer review. The definitive publisher-authenticated version Wood, S. N., 2013, On p-values for smooth components of an extended generalized additive model. Biometrika, is available online at: http://dx.doi.org/10.1093/biomet/ass048
    RefereedYes
    StatusPublished
    ID Code32382

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