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Abstract
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We establish connections between invariant theory and maximum likelihood
estimation for discrete statistical models. We show that norm minimization over a
torus orbit is equivalent to maximum likelihood estimation in log-linear
models. We use notions of stability under a torus action to characterize the
existence of the maximum likelihood estimate, and discuss connections to scaling
algorithms.
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Keywords
maximum likelihood estimation, log-linear models, graphical
models, torus actions, null cone, scaling algorithms
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Mathematical Subject Classification
Primary: 14L24, 20G45, 62F10, 62H22, 62R01
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Milestones
Received: 29 January 2021
Revised: 28 July 2021
Accepted: 27 September 2021
Published: 13 December 2021
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