The method of System Dynamics was used to study the dynamic change trend of many natural resources and environment in the Yellow River delta.
用系统动力学方法研究了黄河三角洲地区多种资源和环境的动态变化趋势。
CONCLUSION: multivariate random coefficients model can effectively analyze the dynamic change trend and random effects of multivariate repeated measures data in medical research.
结论：多变量随机系数模型可有效地进行多变量重复观测数据的动态变化趋势分析以及随机效应分析。
The current situation evaluation is to contrast the current water quality with the water quality standard, the dynamic evaluation can reflect the trend of water quality change.
现状评价是对比现状水质与标准之间的关系，而动态评价可反映水质变化的趋势。
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