其水平可以完全控制的因素。 在分析测试中，试剂浓度，溶液酸度，反应温度，反应时间等均为固定因素
这让你以为时间是个固定因素。
结论三种方法都是分析固定因素和伴时变量交互作用的有效工具。
Conclusion These three approaches are all useful tool in analysis of interaction between time-fixed factors and time-varying variables.
本文采用固定因素估计量，运用FDI区位决定因素模型来测算中国FDI与东南亚经济体FDI之间的关系。
This paper uses fixed-factor estimation to test for the relationships between FDI in South-East Asian economies within a simple model of location determinants of foreign direct investment.
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