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Non‐parametric identification and estimation of the number of components in multivariate mixtures

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Abstract:

We analyse the identifiability of the number of components in k‐variate, M‐component finite mixture models in which each component distribution has independent marginals, including models in latent class analysis. Without making parametric assumptions on the component distributions, we investigate how one can identify the number of components from the distribution function of the observed data. When k≥2, a lower bound on the number of components (M) is non‐parametrically identifiable from the rank of a matrix constructed from the distribution function of the observed variables. Building on this identification condition, we develop a procedure to estimate a lower bound on the number of components consistently.

Keywords: Finite mixture; Latent class analysis; Non‐negative rank; Rank estimation

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/rssb.12022

Publication date: January 1, 2014

bpl/rssb/2014/00000076/00000001/art00006
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