虚拟变量法是一种把随机问题转化成确定性问题求解的方法。
The pseudo variables method was an efficient and accurate algorithm which converts the random problems into the certainty one.
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。
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.
价格指数的变化是连续性的，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。
Dummy variables can only describe the discrete changes of price index, for instance, using dummy variables in sales off-season can not provide upper precision estimating result.
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