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STREAMLINED SOLUTIONS TO MULTILEVEL SPARSE MATRIX PROBLEMS

  • TUI H. NOLAN (a1) and MATT P. WAND (a1)

Abstract

We define and solve classes of sparse matrix problems that arise in multilevel modelling and data analysis. The classes are indexed by the number of nested units, with two-level problems corresponding to the common situation, in which data on level-1 units are grouped within a two-level structure. We provide full solutions for two-level and three-level problems, and their derivations provide blueprints for the challenging, albeit rarer in applications, higher-level versions of the problem. While our linear system solutions are a concise recasting of existing results, our matrix inverse sub-block results are novel and facilitate streamlined computation of standard errors in frequentist inference as well as allowing streamlined mean field variational Bayesian inference for models containing higher-level random effects.

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Keywords

MSC classification

STREAMLINED SOLUTIONS TO MULTILEVEL SPARSE MATRIX PROBLEMS

  • TUI H. NOLAN (a1) and MATT P. WAND (a1)

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