问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
one order MA和second order MA是什么？这个知识点课程里面讲得比较粗
NO.PZ2019040801000059 问题如下 The purpose of more thone orr laggemoving average process is to: A.invert the moving average process to make the formula more useful. B.a exactly two aitionlaggevariables to the originspecification, because 2-norr moving average estimates most accurately. C.a another error term to MA(1) process. a many aitionlaggevariables neeto more robustly estimate the ta series. is correct.考点MA Process anrocess解析在移动平均过程中用很多自变量的意义是为了获得更好的因变量的估计，多滞后几个数据进行估计有时候会获得更可靠的结果。 请问AR(1)的斜率系数是怎么算的啊 还有MA(1)的，是用回归模型的那个式子吗
NO.PZ2019040801000059 请老师一下B，我感觉跟个意思呀
NO.PZ2019040801000059 a exactly two aitionlaggevariables to the originspecification, because 2-norr moving average estimates most accurately. a another error term to MA(1) process. a many aitionlaggevariables neeto more robustly estimate the ta series. is correct. 考点MA Process anrocess 解析在移动平均过程中用很多自变量的意义是为了获得更好的因变量的估计，多滞后几个数据进行估计有时候会获得更可靠的结果。请问A不对吗 我记得上课老师就是这么讲的呀
加更多的自变量会使得模型变得复杂，这个原理是否和在冲突呢？谢谢
