Identifiability Results for Several Classes of Linear Compartment Models

Bulletin of Mathematical Biology
Nicolette MeshkatMarisa Eisenberg

Abstract

Identifiability concerns finding which unknown parameters of a model can be estimated, uniquely or otherwise, from given input-output data. If some subset of the parameters of a model cannot be determined given input-output data, then we say the model is unidentifiable. In this work, we study linear compartment models, which are a class of biological models commonly used in pharmacokinetics, physiology, and ecology. In past work, we used commutative algebra and graph theory to identify a class of linear compartment models that we call identifiable cycle models, which are unidentifiable but have the simplest possible identifiable functions (so-called monomial cycles). Here we show how to modify identifiable cycle models by adding inputs, adding outputs, or removing leaks, in such a way that we obtain an identifiable model. We also prove a constructive result on how to combine identifiable models, each corresponding to strongly connected graphs, into a larger identifiable model. We apply these theoretical results to several real-world biological models from physiology, cell biology, and ecology.

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Citations

Dec 14, 2019·PloS One·Daniel J BatesNicolette Meshkat
Mar 4, 2020·Journal of Mathematical Biology·Elizabeth GrossAnne Shiu
Dec 5, 2018·Computational and Mathematical Methods in Medicine·Jana L Gevertz, Joanna R Wares

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