目的探讨非线性混合效应模型在交叉试验等级资料中的应用，为临床试验交叉设计资料的正确分析提供方法学参考。
Objective To explore the application of nonlinear mixed models in ordered categorical data of cross-over trial analysis and hence provide methodology reference.
模型试验表明，随着试验荷载等级的提高，各测点的应力呈线性增长，结构的受力处于线弹性阶段。
According to the test results, as the load levels increased, the stress of the measuring points increases linearly. The structure worked in elastic behavior.
模型试验表明，随着试验荷载等级的提高，各测点的应力呈线性增长，结构的受力处于线弹性阶段。
According to the test results, as the load levels increased, the stress of the measuring points increases linearly. The structure worked in elastic behavior.
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