The determinants and productivity growth are analyzed by using regression techniques for limited dependent variable models with random effects 然后，运用虚拟因变量方法分析影响全要素生产率变化的具体因素。
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Then it gives some advices about raising the tfp . the dissertation ' s main contribution lies in using malmquist - dea method and regression techniques for limited dependent variable models with random effects 本论文的主要贡献在于把扩展的malmqust dea方法引入交通运输业并运用虚拟因变量回归模型考察全要素生产率变化的影响因素。
