By constructing instrumentvariable in term of the geographic characteristics, we efficiently tackle the problem of endogeneity in the regressions.
本文根据地理特征构造工具变量,有效地控制了变量的内生性问题。
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Variable Angle spectroscopic ellipsometry (VASE) is a instrument for measuring optical film refractive index and thickness and is a powerful technique for research on new materials and processes.