说明： 混合R语言，pdf+word说明，一种经典的调用R语言的方法，有PDF说明，但pdf是英语版的，很好同时还可以锻炼英语水平 (Mixed R language, pdf+word description, a classic call R language method, there are PDF instructions, but PDF is the English version, very good, at the same time can also exercise English level)
