UNIGE document Scientific Article
previous document  unige:96021  next document
add to browser collection
Title

Stochastic variable selection strategies for zero-inflated models

Authors
Auda, Marie
Published in Statistical Modelling: An International Journal. 2017, p. 1471082X1771106
Abstract When count data exhibit excess zero, that is more zero counts than a simpler parametric distribution can model, the zero-inflated Poisson (ZIP) or zeroinflated negative binomial (ZINB) models are often used. Variable selection for these models is even more challenging than for other regression situations because the availability of p covariates implies 4p possible models. We adapt to zero-inflated models an approach for variable selection that avoids the screening of all possible models. This approach is based on a stochastic search through the space of all possible models, which generates a chain of interesting models. As an additional novelty, we propose three ways of extracting information from this rich chain and we compare them in two simulation studies, where we also contrast our approach with regularization (penalized) techniques available in the literature. The analysis of a typical dataset that has motivated our research is also presented, before concluding with some recommendations.
Keywords Excess zeroZI modelHurdle modelVariable selectionStochastic search
Identifiers
Full text
Structures
Citation
(ISO format)
CANTONI, Eva, AUDA, Marie. Stochastic variable selection strategies for zero-inflated models. In: Statistical Modelling: An International Journal, 2017, p. 1471082X1771106. https://archive-ouverte.unige.ch/unige:96021

9 hits

0 download

Update

Deposited on : 2017-08-07

Export document
Format :
Citation style :