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arXiv 2602.05784stat.ME
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校正功能协变量中的测量误差和零膨胀问题以进行标量对函数分位数回归

Correcting Measurement Error and Zero Inflation in Functional Covariates for Scalar-on-Function Quantile Regression

Indiana University School of Public Health(印第安纳大学公共卫生学院);Oregon State University(俄勒冈州立大学);Marmara University(马尔马拉大学);Texas A&M University School of Public Health(德克萨斯农工大学公共卫生学院);Columbia University Mailman School of Public Health(哥伦比亚大学米尔曼公共卫生学院)

Caihong Qin, Lan Xue, Ufuk Beyaztas, Roger S. Zoh, Mark Benden, Jeff Goldsmith, Carmen D. Tekwe

AI总结:

本文提出了一种校正功能协变量中测量误差和零膨胀问题的新方法,通过有效性指标和联合分位数回归提高了估计准确性。

摘要:

可穿戴设备收集时间变化的生物行为数据,为研究行为如何影响健康结果提供了机会。然而,这些数据通常包含测量误差和过多的零值(由于不佩戴、久坐行为或连接问题),每个都具有受试者特定的分布特征。当前的统计方法未能同时解决这些问题。我们引入了一种新的建模框架,用于零膨胀和易错的功能数据,通过纳入一个受试者特定的时间变化有效性指标,明确区分结构性零值和内在值。我们通过最大似然法迭代估计潜在的功能协变量和零膨胀概率,使用基函数展开和线性混合模型来调整测量误差。为了评估恢复的潜在协变量的影响,我们应用了多个分位数水平的联合分位数回归。通过广泛的模拟,我们证明了我们的方法在仅解决测量误差的方法上显著提高了估计准确性,并且联合估计相比单独拟合分位数回归有显著改进。应用于儿童肥胖研究,我们的方法有效校正了步数中的零膨胀和测量误差,得到的结果与能量消耗密切相关,支持其作为体力活动代理的使用。

英文摘要:

Wearable devices collect time-varying biobehavioral data, offering opportunities to investigate how behaviors influence health outcomes. However, these data often contain measurement error and excess zeros (due to nonwear, sedentary behavior, or connectivity issues), each characterized by subject-specific distributions. Current statistical methods fail to address these issues simultaneously. We introduce a novel modeling framework for zero-inflated and error-prone functional data by incorporating a subject-specific time-varying validity indicator that explicitly distinguishes structural zeros from intrinsic values. We iteratively estimate the latent functional covariates and zero-inflation probabilities via maximum likelihood, using basis expansions and linear mixed models to adjust for measurement error. To assess the effects of the recovered latent covariates, we apply joint quantile regression across multiple quantile levels. Through extensive simulations, we demonstrate that our approach significantly improves estimation accuracy over methods that only address measurement error, and joint estimation yields substantial improvements compared with fitting separate quantile regressions. Applied to a childhood obesity study, our approach effectively corrects for zero inflation and measurement error in step counts, yielding results that closely align with energy expenditure and supporting their use as a proxy for physical activity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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