急求，请大家帮忙解读下该论文中第30页提到的：

1，real export receipts波动率计算方法：
Volatility is calculated using annual data and is the standard error of a regression of trend real exports.
此处如何做回归？因变量，自变量各是什么？

2，NEER波动率的计算方法：

Annual volatility is calculated using the previous 24 months of data and is the standard deviation

of the innovation of the percentage change in the nominal effective exchange rate.

什么是Innovation of % change In NEER? 如何计算？

谢谢各位！