问题描述：
英语翻译
Firm characteristics such as size and labor productivity are expressed in log forms.
We try to avoid an endogeneity problem by using lagged values on S&T and other
independent variables in our estimations.However,we will also use a matching ap-
proach,both as a robustness check and as an alternative attempt to control for the
possibility that S&T is a function of,for instance,job growth.
S&T是科学的意思
Firm characteristics such as size and labor productivity are expressed in log forms.
We try to avoid an endogeneity problem by using lagged values on S&T and other
independent variables in our estimations.However,we will also use a matching ap-
proach,both as a robustness check and as an alternative attempt to control for the
possibility that S&T is a function of,for instance,job growth.
S&T是科学的意思
问题解答：
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