Djordjilovic, Vera - Chiogna, Monica (2017) Searching for a Source of Difference: a Graphical Model Approach. [Working Paper] WORKING PAPER SERIES, 4/2017 . , PADOVA (Inedito)
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In this work, we look at a two-sample problem within the framework of Gaussian graphical models. When the global hypothesis of equality of two distributions is rejected, the interest is usually in localizing the source of di erence. Motivated by the idea that diseases can be seen as system perturbations, and by the need to distinguish between the origin of perturbation and components aected by the perturbation, we introduce the concept of a minimal seed set, and its graphical counterpart a graphical seed set. They intuitively consist of variables driving the dierence between the two conditions.
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