请问下面几句话中的control for什么意思啊？

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We control for company size ( SIZE it ), the market-to-book ratio ( MB it ), and leverage ( LEV it ).

The STOCK i variable controls for any time-invariant differences between the treatment sample of stock-financed acquirers ( STOCK i = 1) and the control sample of cash-financed acquirers ( STOCK i = 0).

We control for this by using cash-financed acquirers rather than non-acquirers as our control group.

请问上面几句话中的control for都是一个意思吗？如何理解啊？

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关键词：control Contro contr trol For

逢考必过君 发表于 2018-10-23 19:36
We control for company size ( SIZE it ), the market-to-book ratio ( MB it ), and leverage ( LEV it ) ...

control。这里是不及物动词，所以后看接for。<br>
control for的意思是 需要考虑的受控因子是。可以翻译成 考察（因子）。