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。
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。
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