翻译一句话

We estimate the change in economic growth rates before and after branch reform relative to a control group of states unaffected by reform using a generalized “difference-in-differences” method

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使用一般化的“倍差法”，我们来估计部门改革前后，相对于一组不受改革影响的控制（对照）国家的，经济增长的变化