急问：firm-year observation是什么意思?firm-year是公司年度的意思吗? 原句说的是： Our examination is based on the data of 289,055 firm-year observations from 1991 to 2010.
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急问：firm-year observation是什么意思?firm-year是公司年度的意思吗? 原句说的是： Our examination is based on the data of 289,055 firm-year observations from 1991 to 2010.
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