dummy variable name

例句：

1. 1. In this study, we used a dummy variable to control for confounding factors.
   在这项研究中，我们使用了一个虚拟变量来控制混杂因素。
2. 2. The dummy variable was used to identify the effect of the treatment on the outcome.
   这个虚拟变量被用来识别治疗对结果的影响。
3. 3. The researcher controlled for the dummy variable in their analysis to ensure the results were not biased.
   研究者在其分析中控制了虚拟变量，以确保结果不会受到偏见的影响。