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• W2000935078 abstract "We investigate a method for extracting nonlinear principal components (NPCs). These NPCs maximize variation subject to smoothness and orthogonality constraints; but we allow for a general class of constraints and multivariate probability densities, including densities without compact support and even densities with algebraic tails. We provide primitive sufficient conditions for the existence of these NPCs. By exploiting the theory of continuous-time, reversible Markov diffusion processes, we give a different interpretation of these NPCs and the smoothness constraints. When the diffusion matrix is used to enforce smoothness, the NPCs maximize long-run variation relative to the overall variation subject to orthogonality constraints. Moreover, the NPCs behave as scalar autoregressions with heteroskedastic innovations; this supports semiparametric identification and estimation of a multivariate reversible diffusion process and tests of the overidentifying restrictions implied by such a process from low-frequency data. We also explore implications for stationary, possibly nonreversible diffusion processes. Finally, we suggest a sieve method to estimate the NPCs from discretely-sampled data." @default.
• W2000935078 created "2016-06-24" @default.
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• W2000935078 date "2009-12-01" @default.
• W2000935078 modified "2023-09-23" @default.
• W2000935078 title "Nonlinear principal components and long-run implications of multivariate diffusions" @default.
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• W2000935078 doi "https://doi.org/10.1214/09-aos706" @default.
• W2000935078 hasPublicationYear "2009" @default.
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