This highlights how important sample selection is in estimating empirical FDI models, particularly those with spatial terms, if one wants to be able to relate such results back to FDI theory.

• 这突出多么重要样本选择是外国直接投资估算实证模型，特别是那些与空间的条件，如果一个人希望能与这样的结果回的外国直接投资的理论。