常見例句We adopt Battese and Coelli's (1995) model of stochastic frontier function and apply the software Frontier4.1 to evaluate the cost inefficiency score. 研究發(fā)現(xiàn)，研發(fā)支出與成本傚率呈正相關(guān)關(guān)系，即研發(fā)支出越多，成本傚率越高。 返回 Coelli