Q: Walk us through the process of creating a certification test?
问：向我们介绍一下创建认证测试的流程？
Welding process certification test is an important test complied with EN standard to validate the welding process, ensure the welding quality and meet the requirements of manufacture in large scale.
焊接工艺认证试验是在焊接生产中根据欧洲标准，验证焊接工艺、保证焊接质量，从而满足大规模生产需要的重要试验。
High-level ARCH effect is certification in the BDI logarithm process by ARCH LM test, GARCH(1,1)model is used to eliminate the conditional heteroscedasticity.
通过ARCH LM检验认为BD I对数序列存在高阶ARCH效应，并用GARCH（1，1）模型消除残差序列的条件异方差性。
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