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• W2952330468 abstract "Functional data typically contain amplitude and phase variation. In many data situations, phase variation is treated as a nuisance effect and is removed during preprocessing, although it may contain valuable information. In this note, we focus on joint principal component analysis (PCA) of amplitude and phase variation. As the space of warping functions has a complex geometric structure, one key element of the analysis is transforming the warping functions to . We present different transformation approaches and show how they fit into a general class of transformations. This allows us to compare their strengths and limitations. In the context of PCA, our results offer arguments in favour of the centred log‐ratio transformation. We further embed two existing approaches from the literature for joint PCA of amplitude and phase variation into the framework of multivariate functional PCA, where we study the properties of the estimators based on an appropriate metric. The approach is illustrated through an application from seismology." @default.
• W2952330468 created "2019-06-27" @default.
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• W2952330468 date "2019-01-01" @default.
• W2952330468 modified "2023-10-17" @default.
• W2952330468 title "A general framework for multivariate functional principal component analysis of amplitude and phase variation" @default.
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• W2952330468 doi "https://doi.org/10.1002/sta4.220" @default.
• W2952330468 hasPublicationYear "2019" @default.
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