Identifiability of linear compartmental models: The singular locus
Identifiability of linear compartmental models: The singular locus
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线性区室模型的可识别性:奇异轨迹
DOI:
10.1016/j.aam.2021.102268
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发表时间:
2022
影响因子:
1.1
通讯作者:
Shiu, Anne
中科院分区:
文献类型:
--
作者:
Gross, Elizabeth;Meshkat, Nicolette;Shiu, Anne
This work addresses the problem of identifiability, that is, the question of whether parameters can be recovered from data, for linear compartmental models. Using standard differential algebra techniques, the question of whether a given model is generically locally identifiable is equivalent to asking whether the Jacobian matrix of a certain coefficient map, arising from input-output equations, is generically full rank. A natural next step is to study the set of parameter values where the Jacobian matrix drops in rank, which we refer to as thelocus of non-identifiable parameter values, or, for short, thesingular locus. In this work, we give a formula for coefficient maps in terms of acyclic subgraphs of the model's underlying directed graph and, then, study the case when the singular locus is defined by a single equation, thesingular-locus equation. We prove that the singular-locus equation can be used to determine when submodels are generically locally identifiable. We also determine the singular-locus equation for two families of linear compartmental models, cycle and mammillary (star) models with input and output in a single compartment. We also state a conjecture for the corresponding equation for a third family: catenary (path) models. Finally, we introduce theidentifiability degree, which is the number of parameter values that map to a generic input-output data vector. This degree was previously computed for mammillary and catenary models, and here we determine this degree for cycle models.
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影响因子:
13.5
作者:
T. Tozer
通讯作者:
T. Tozer
影响因子:
3.5
作者:
Meshkat, Nicolette;Sullivant, Seth;Eisenberg, Marisa
通讯作者:
Eisenberg, Marisa
影响因子:
3.4
作者:
Mones Berman;Ezra Shahn;Marjory F. Weiss
通讯作者:
Marjory F. Weiss
影响因子:
2
作者:
R. Mulholland;M. Keener
通讯作者:
M. Keener
DOI:
10.1016/0025-5564(83)90089-5
发表时间:
1983
期刊:
Bellman Prize in Mathematical Biosciences
影响因子:
--
作者:
S. Audoly;L. D'Angiò
通讯作者:
L. D'Angiò