This element is to provide randomization for a test run sequence, rather than running the test sequentially, by adding random selector.
这个元素用来通过添加随机选择器，为一个测试运行序列提供随机选择，而不是按照测试顺序地运行。
The sample with the trend function rejected is a stationary random sequence of a sample. This stationary random sequence is fitted in with the ar (3) model and a statistical test is put to this model.
从样本中剔除趋势后是平稳随机序列的一段样本，对该平稳序列用AR(3)模型进行拟合，并对模型进行统计检验。
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