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Gaussian graphical modeling for spectrometric data analysis

Author

Listed:
  • Codazzi, Laura
  • Colombi, Alessandro
  • Gianella, Matteo
  • Argiento, Raffaele
  • Paci, Lucia
  • Pini, Alessia

Abstract

Motivated by the analysis of spectrometric data, a Gaussian graphical model for learning the dependence structure among frequency bands of the infrared absorbance spectrum is introduced. The spectra are modeled as continuous functional data through a B-spline basis expansion and a Gaussian graphical model is assumed as a prior specification for the smoothing coefficients to induce sparsity in their precision matrix. Bayesian inference is carried out to simultaneously smooth the curves and to estimate the conditional independence structure between portions of the functional domain. The proposed model is applied to the analysis of infrared absorbance spectra of strawberry purees.

Suggested Citation

  • Codazzi, Laura & Colombi, Alessandro & Gianella, Matteo & Argiento, Raffaele & Paci, Lucia & Pini, Alessia, 2022. "Gaussian graphical modeling for spectrometric data analysis," Computational Statistics & Data Analysis, Elsevier, vol. 174(C).
    • Handle: RePEc:eee:csdana:v:174:y:2022:i:c:s0167947321002504
    DOI: 10.1016/j.csda.2021.107416
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    References listed on IDEAS

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