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DTSTART:20260329T010000
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DTSTART;TZID=Europe/Helsinki:20260504T140000
DTEND;TZID=Europe/Helsinki:20260504T153000
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SUMMARY:Mathias DRTON (TU Munich) - "Parameter identification in linear non-Gaussian causal models under general confounding"
DESCRIPTION:Statistical Seminar: Every Monday at 2:00 pm.\nTime: 2:00 pm – 3:00 pm\nDate: 4th May\nPlace: 3001 \nMathias DRTON (TU Munich) – Parameter identification in linear non-Gaussian causal models under general confounding \n Abstract:  \nLinear non-Gaussian causal models postulate that each random variable is a linear function of parent variables and non-Gaussian exogenous error terms. We study identification of the linear coefficients when such models contain latent variables. Our focus is on the commonly studied acyclic setting\, where each model corresponds to a directed acyclic graph (DAG). For this case\, prior literature has demonstrated that connections to overcomplete independent component analysis yield effective criteria to decide parameter identifiability in latent variable models. However\, this connection is based on the assumption that the observed variables linearly depend on the latent variables. Departing from this assumption\, we treat models that allow for arbitrary nonlinear latent confounding. Our main result is a graphical criterion that is necessary and sufficient for deciding the generic identifiability of direct causal effects. Moreover\, we provide an algorithmic implementation of the criterion with a run time that is polynomial in the number of observed variables. Finally\, we report on estimation heuristics based on the identification result and explore a generalization to models with feedback loops.\nOrganizers: \nAnna KORBA (CREST)\, Vincent DIVOL (CREST) \, Jaouad MOURTADA (CREST) \nSponsors:\nCREST-CMAP \n
URL:https://crest.science/event/mathias-drton-tu-munich-tba/
CATEGORIES:Seminars,Statistics
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