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On principal graphical models with application to gene network

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  • Kim, Kyongwon

Abstract

The principal graphical model is introduced by incorporating the ideas from the linear sufficient dimension reduction (SDR) methods such as the sliced inverse regression and sliced average variance estimation to a nonparametric graphical model. A nonparametric graphical model is a widely used method to investigate undirected graphs. However, when the number of nodes is large, a nonparametric graphical model suffers from the ‘curse of dimensionality’ because they contain intrinsic high dimensional kernels. The parametric graphical models such as the Gaussian or copula Gaussian graphical models are also well known for their intuitive structure and interpretability. However, they hinge on strong parametric model assumptions. The principal graphical model applies well-known linear SDR techniques to the nonparametric graphical models to enhance performance in high dimensional networks, avoid model assumptions, and maintain interpretability. We use components of linear SDR as modules and implement them in the (p2) pairs of variables in the network to evaluate conditional independence. In the numerical experiment, our methods have competitive accuracy in both low and high-dimensional settings. Our methods are applied to the DREAM 4 challenge gene network dataset and they work well in high dimensional settings with a limited number of observations.

Suggested Citation

  • Kim, Kyongwon, 2022. "On principal graphical models with application to gene network," Computational Statistics & Data Analysis, Elsevier, vol. 166(C).
  • Handle: RePEc:eee:csdana:v:166:y:2022:i:c:s016794732100178x
    DOI: 10.1016/j.csda.2021.107344
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    References listed on IDEAS

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    Cited by:

    1. Heng, Pei & Sun, Yi, 2023. "Algorithms for Convex Hull Finding in Undirected Graphical Models," Applied Mathematics and Computation, Elsevier, vol. 445(C).

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