Marginal regression model and its associated generalized estimating equation (GEE) are becoming increasingly being used in longitudinal studies.

边际回归模型和与此有关的广义估计方程(GEE)在纵向数据分析中得到了广泛的应用。

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Summary of Background Data. Longitudinal studies to investigate NSP incidence and risk factors are rare, and even fewer have been conducted in middle - and low-income countries.

背景知识概要：关于颈肩痛的发生率及其危险因子的纵向研究不多，而在中低收入国家进行的此类研究更加少见。

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The paper studies non-iterative bidirectional beam propagation method based on scattering operators which is used in numerical analysis of optical waveguide with abrupt longitudinal refractive index.

本文主要研究了基于散射算子的非迭代双向光束传输法数值分析纵向折射率有突变光波导的稳定性和精度等问题。

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The longitudinal studies that have been done have shown no difference in emotional and mental health between children raised by gay and lesbian parents and children raised by heterosexual parents.

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