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Learning high-dimensional Gaussian linear structural equation models with heterogeneous error variances

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  • Park, Gunwoong
  • Kim, Yesool

Abstract

A new approach is presented for learning high-dimensional Gaussian linear structural equation models from only observational data when unknown error variances are heterogeneous. The proposed method consists of three steps: inferring (1) the moralized graph using the inverse covariance matrix, (2) the ordering using conditional variances, and (3) the directed edges using conditional independence relationships. These three problems can be efficiently addressed using inversion of parts of the covariance matrix. It is proved that a sample size of n=Ω(dm2logp) is sufficient for the proposed algorithm to recover the true directed graph, where p is the number of nodes and dm is the maximum degree. It is also shown that the proposed algorithm requires O(p3+pdm4) operations in the worst-case, and hence, it is computationally feasible for recovering large-scale graphs. It is verified through simulations that the proposed algorithm is statistically consistent and computationally feasible in high-dimensional and large-scale graph settings, and performs well compared to the state-of-the-art structural learning algorithms. It is also demonstrated through protein signaling data that our algorithm is well-suited to the estimation of directed acyclic graphical models for multivariate data in comparison to other methods used for normally distributed data.

Suggested Citation

  • Park, Gunwoong & Kim, Yesool, 2021. "Learning high-dimensional Gaussian linear structural equation models with heterogeneous error variances," Computational Statistics & Data Analysis, Elsevier, vol. 154(C).
    • Handle: RePEc:eee:csdana:v:154:y:2021:i:c:s0167947320301754
    DOI: 10.1016/j.csda.2020.107084
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    References listed on IDEAS

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    1. Odd O. Aalen & Kjetil Røysland & Jon Michael Gran & Bruno Ledergerber, 2012. "Causality, mediation and time: a dynamic viewpoint," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 175(4), pages 831-861, October.
    2. Wenyu Chen & Mathias Drton & Y Samuel Wang, 2019. "On causal discovery with an equal-variance assumption," Biometrika, Biometrika Trust, vol. 106(4), pages 973-980.
    3. J. Peters & P. Bühlmann, 2014. "Identifiability of Gaussian structural equation models with equal error variances," Biometrika, Biometrika Trust, vol. 101(1), pages 219-228.
    4. Ming Yuan & Yi Lin, 2007. "Model selection and estimation in the Gaussian graphical model," Biometrika, Biometrika Trust, vol. 94(1), pages 19-35.
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    Cited by:

    1. Choi, Semin & Kim, Yesool & Park, Gunwoong, 2023. "Densely connected sub-Gaussian linear structural equation model learning via ℓ1- and ℓ2-regularized regressions," Computational Statistics & Data Analysis, Elsevier, vol. 181(C).

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