我刚刚开始自学时间序列，申请一个intern的时候遇到下列问题，麻烦请版上的大牛们
指点一二，感激不尽：
怎么判断一个time series是在follow 一个ARMA过程的?
用5种automated strategy？
Give a description of a possible strategy to be long volatility in trading
only the stock.
What kind of asset is usually modelled by a GARCH process ? Give a brief
description.
