首页> 外文会议>2008年国际应用统计学术研讨会(2008 International Institute of Applied Statistics Studies)论文集 >Fitting Chapman-Richards Models with Fixed and Random Coefficients for Dahurian Larch in S-Plus
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Fitting Chapman-Richards Models with Fixed and Random Coefficients for Dahurian Larch in S-Plus

机译:用S和Plus中的Dahurian落叶松拟合具有固定系数和随机系数的Chapman-Richards模型

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Statistical models in which both fixed and random effects enter nonlinearly are becoming increasingly popular. These models have a wide variety of applications, one of the most common being nonlinear growth data. In this study, tree growth data set from forestry is used for nonlinear mixedeffects analysis. Nonlinear mixed-effects models involve both fixed effects and random effects. The process of model building for nonlinear mixed-effects models is to determine which parameters should be random effects and which should be purely fixed effects, as well as procedures for determining random effects variance-covariance matrices (e.g. diagonal matrices) to reduce the number of the parameters in the model. We also consider procedures for determining covariates to explain interindividual parameter variability. Information criterion statistics are used for comparing different structures of the random effects components. These methods are illustrated using the nonlinear mixedeffects methods in S-Plus software.
机译:固定效应和随机效应都非线性地进入的统计模型正变得越来越流行。这些模型具有广泛的应用,其中最常见的一种是非线性增长数据。在这项研究中,将来自林业的树木生长数据集用于非线性混合效应分析。非线性混合效应模型涉及固定效应和随机效应。建立非线性混合效应模型的过程是确定哪些参数应该是随机效应,哪些参数应该是纯固定效应,以及确定随机效应方差-协方差矩阵(例如对角矩阵)以减少数量的过程。模型中的参数。我们还考虑了确定协变量的过程,以解释个体间的参数变异性。信息标准统计信息用于比较随机效应组件的不同结构。使用S-Plus软件中的非线性混合效应方法说明了这些方法。

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