Fast estimation and choice of confidence interval methods for step regression

Article


Hua, Shuangcheng, Fong, Youyi and Kath, Jarrod. 2022. "Fast estimation and choice of confidence interval methods for step regression." Environmental and Ecological Statistics. 29 (4), pp. 779-799. https://doi.org/10.1007/s10651-022-00547-2
Article Title

Fast estimation and choice of confidence interval methods for step regression

ERA Journal ID799
Article CategoryArticle
AuthorsHua, Shuangcheng (Author), Fong, Youyi (Author) and Kath, Jarrod (Author)
Journal TitleEnvironmental and Ecological Statistics
Journal Citation29 (4), pp. 779-799
Number of Pages21
Year2022
Place of PublicationUnited States
ISSN1352-8505
1573-3009
Digital Object Identifier (DOI)https://doi.org/10.1007/s10651-022-00547-2
Web Address (URL)https://link.springer.com/article/10.1007/s10651-022-00547-2
Abstract

In this paper we propose a new fast grid search algorithm for finding the least square estimators of a step regression model. This algorithm makes it practical to compute resampling-based confidence intervals for step regression models. We introduce five data generating models, including one where the mean model is a step model (model correctly specified) and four where the mean models are not step models (model misspecified), and use them to study the coverage probabilities of two new types of resampling-based confidence intervals for step regression: symmetric percentile bootstrap confidence intervals and subsampling confidence intervals using a new set of rules-of-thumb to select block size. Our results show that when the model is correctly specified, the symmetric percentile Efron bootstrap confidence intervals provide close-to-nominal coverage and have shorter intervals than the subsampling methods; when the model is misspecified, the subsampling method using the rules-of-thumb provides good coverage and shorter confidence intervals than the symmetric percentile Efron bootstrap method and the subsampling method using a double bootstrap-like procedure for block size selection. Finally, we apply the proposed methods to a real world environmental dataset on the relationship between grassland productivity, soil moisture anomalies and other hydro-climatic and land use variables to provide inference for the threshold in soil moisture anomalies, across which there is a jump in grassland productivity.

KeywordsDynamic programming; Ecology; Subsampling; Symmetric percentile bootstrap confidence intervals
ANZSRC Field of Research 2020410299. Ecological applications not elsewhere classified
490501. Applied statistics
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsUniversity of Washington, United States
School of Agriculture and Environmental Science
Institution of OriginUniversity of Southern Queensland
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