Note that the dummy variable declaration has disappeared: you don't need it because you now have an actual statement in the exception handler.
注意，伪变量声明已经没有了：不再需要它是因为现在在异常处理函数中有了实际的语句。
Objective: To explore the application of dummy variable in statistical analysis.
目的：探讨哑变量在统计分析中的应用。
Results: By using dummy variable, we can broaden the application of regression analysis.
结果：正确使用哑变量，扩大回归模型的应用范围。
The dummy variables can only describe discrete changes in price indices, such as selling off-season dummy variable method will not be able to provide high precision analysis.
而虚拟变量只能描述价格指数的离散变化，比如在销售淡季虚拟变量法就不能提供精度较高的分析结果。
Method: Dummy variable is used for analysis of covariance and analysis of variance.
方法：在协方差分析与方差分析中使用哑变量。
Dummy variable: a constructed variable used AS a means of including factors that are not naturally quantifiable in an econometric model.
虚变量：一个虚构的变量，用来包括在经济模型中不能自然量化的因素。
Dummy variable: a constructed variable used AS a means of including factors that are not naturally quantifiable in an econometric model.
虚变量：一个虚构的变量，用来包括在经济模型中不能自然量化的因素。
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