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Keywords:

  • Amplitude misalignment;
  • Bayesian inference;
  • Functional data analysis;
  • Markov chain Monte Carlo sampling;
  • Time warping;
  • Warping components;
  • Warping function

Summary.  Warping is an approach to the reduction and analysis of phase variability in functional observations, by applying a smooth bijection to the function argument. We propose a natural representation of warping functions in terms of a new type of elementary functions named ‘warping component functions’, or ‘warplets’, which are combined into the warping function by composition. The inverse warping function is trivial and explicit to obtain. A sequential Bayesian estimation strategy is introduced which fits a series of models and transfers the posterior of the previous fit into the prior of the next fit. Model selection is based on a warping analogue to wavelet thresholding, combined with Bayesian inference.