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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/1903.08611 |
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| _version_ | 1866918374251954176 |
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| author | Améndola, Carlos Pham, Viet Son |
| author_facet | Améndola, Carlos Pham, Viet Son |
| contents | We study the autocovariance functions of moving average random fields over the integer lattice $\mathbb{Z}^d$ from an algebraic perspective. These autocovariances are parametrized polynomially by the moving average coefficients, hence tracing out algebraic varieties. We derive dimension and degree of these varieties and we use their algebraic properties to obtain statistical consequences such as identifiability of model parameters. We connect the problem of parameter estimation to the algebraic invariants known as euclidean distance degree and maximum likelihood degree. Throughout, we illustrate the results with concrete examples. In our computations we use tools from commutative algebra and numerical algebraic geometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1903_08611 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Autocovariance Varieties of Moving Average Random Fields Améndola, Carlos Pham, Viet Son Statistics Theory Algebraic Geometry 60G60, 62M10, 62F10, 14Q15, 13P25 We study the autocovariance functions of moving average random fields over the integer lattice $\mathbb{Z}^d$ from an algebraic perspective. These autocovariances are parametrized polynomially by the moving average coefficients, hence tracing out algebraic varieties. We derive dimension and degree of these varieties and we use their algebraic properties to obtain statistical consequences such as identifiability of model parameters. We connect the problem of parameter estimation to the algebraic invariants known as euclidean distance degree and maximum likelihood degree. Throughout, we illustrate the results with concrete examples. In our computations we use tools from commutative algebra and numerical algebraic geometry. |
| title | Autocovariance Varieties of Moving Average Random Fields |
| topic | Statistics Theory Algebraic Geometry 60G60, 62M10, 62F10, 14Q15, 13P25 |
| url | https://arxiv.org/abs/1903.08611 |