There are three main methods of cost estimation: expert method, analog method and parameters model method.
成本估算主要有三种方法：专家判定法、类比法、参数模型法。
The method is used when the model is complex and nonlinear (that is, parameters do not co-vary in a linear manner), or when the model involves more than just two or three uncertain parameters.
当模型复杂且非线性时（换句话说，在线性方式下参数不共变），或者当模型涉及多于两三个不确定参数时，使用该方法。
The model parameters of controlled objects were obtained with relay feedback identification method.
通过继电反馈辨识方法获得被控对象模型参数。
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