Geometry of rational quasi-independence models as toric fiber products
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917174360145920 |
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| author | Coons, Jane Ivy Harrington, Heather A. Paul, Niharika Chakrabarty |
| author_facet | Coons, Jane Ivy Harrington, Heather A. Paul, Niharika Chakrabarty |
| contents | We investigate the geometry of a family of log-linear statistical models called quasi-independence models. The toric fiber product is useful for understanding the geometry of parameter inference in these models because the maximum likelihood degree is multiplicative under the TFP. We define the coordinate toric fiber product, or cTFP, and give necessary and sufficient conditions under which a quasi-independence model is a cTFP of lower-order models. We show that the vanishing ideal of every 2-way quasi-independence model with ML-degree 1 can be realized as an iterated toric fiber product of linear ideals. We also classify which Lawrence lifts of 2-way quasi-independence models are cTFPs and give a necessary condition under which a $k$-way model has ML-degree 1 using its facial submodels. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_13897 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Geometry of rational quasi-independence models as toric fiber products Coons, Jane Ivy Harrington, Heather A. Paul, Niharika Chakrabarty Algebraic Geometry Combinatorics Statistics Theory 62R01, 14M25, 62F30, 05C90 We investigate the geometry of a family of log-linear statistical models called quasi-independence models. The toric fiber product is useful for understanding the geometry of parameter inference in these models because the maximum likelihood degree is multiplicative under the TFP. We define the coordinate toric fiber product, or cTFP, and give necessary and sufficient conditions under which a quasi-independence model is a cTFP of lower-order models. We show that the vanishing ideal of every 2-way quasi-independence model with ML-degree 1 can be realized as an iterated toric fiber product of linear ideals. We also classify which Lawrence lifts of 2-way quasi-independence models are cTFPs and give a necessary condition under which a $k$-way model has ML-degree 1 using its facial submodels. |
| title | Geometry of rational quasi-independence models as toric fiber products |
| topic | Algebraic Geometry Combinatorics Statistics Theory 62R01, 14M25, 62F30, 05C90 |
| url | https://arxiv.org/abs/2405.13897 |