大家好，最近阅读文献中，关于文章中使用的匹配方法存在疑问。
我的理解是按以下公式的思路来匹配控制组。
Min_distance=|MVcontrol-MVban|/MVban + |VOLcontrol-VOLban|/VOLban
请问这种匹配方法具体名称是什么呢？
在stata中应该如何实行呢？

原文如下：
“We create a matched control sample of 727 stocks for which shorting was
never banned. These stocks are matched by listing exchange, the presence or
absence of listed options, market capitalization at the end of 2007, and dollar
trading volume from January through July 2008. As a distance metric, we
compute the absolute value of the proportional market-cap difference between
the nonbanned match candidate and the banned stock plus the analogous
absolute value of the proportional dollar trading volume difference.”