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This paper considers a new estimating method for the bent line quantile regression model. By a simple linearization technique, the proposed method can simultaneously obtain the estimates of the regression coefficients and the change-point location. Moreover, it can be readily implemented by current software. Simulation studies demonstrate that the proposed method has good finite sample performance. Two empirical applications are also presented to illustrate the method.
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BMC Public Health
October 2024
Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
Background: Obesity in childhood has deleterious consequences for health while improving physical fitness can significantly reduce health risks related to high body mass index. We aimed to examine the evolution of disparities in physical fitness based on weight status among 7-15-year-olds in Slovenia between 1989 and 2019 and compare these trends across sex, age and socioeconomic status.
Methods: We used annual data collected within the SLOfit monitoring system in the period between 1989 and 2019, totalling 4,256,930 participants (about 137 000 per year).
JAMA Pediatr
June 2023
Department of Medicine and Therapeutics, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong, China.
Importance: The incidence of inflammatory bowel disease (IBD) is increasing in newly industrialized countries but disease etiologies remain unclear.
Objective: To investigate the association between physical fitness and subsequent IBD risk among children and adolescents in Taiwan.
Design, Setting, And Participants: This nationwide cohort study was conducted between January 1, 2010, and December 31, 2018.
Comput Stat
June 2017
School of Finance and Statistics, Hunan University, Changsha 410082, China.
This paper considers a new estimating method for the bent line quantile regression model. By a simple linearization technique, the proposed method can simultaneously obtain the estimates of the regression coefficients and the change-point location. Moreover, it can be readily implemented by current software.
View Article and Find Full Text PDFBiometrics
March 2011
Department of Statistics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Quantile regression, which models the conditional quantiles of the response variable given covariates, usually assumes a linear model. However, this kind of linearity is often unrealistic in real life. One situation where linear quantile regression is not appropriate is when the response variable is piecewise linear but still continuous in covariates.
View Article and Find Full Text PDFAm J Clin Nutr
May 2009
General Internal Medicine Section, Medical Service, Veterans Affairs Medical Center, San Francisco, CA, USA.
Background: alpha-Linolenic acid (ALA; 18:3n-3) has been associated inconsistently with an increased risk of prostate cancer. Additional studies have become available since the publication of 2 previous meta-analyses.
Objective: The objective was to review the published data on the relation between ALA and prostate cancer.