It doesn't tend to go back anywhere,

它不会趋向于回到任何地方
but here we have a center.

但在此例中我们假设有一个中心点
What do I call that?

该称它为什么
I'll call it--x-bar is this point here, not necessarily 0.

我称它为 x拔是这一点并不一定为0
It says that Xt-Xbar== Xbar + ρ(Xt-1 - Xbar)+ et.

即[公式如下]
ρ Lies between minus one and positive one; usually it's positive.

ρ赋值于-1与1之间通常是正值
You see that? So ρ--the smaller ρ is,

看见了吗 ρ越小
the tighter the elastic cord is.

弹性绳索的约束越强
It gets pulled back by 1- ρ of the way

每个期间它都被1-ρ拉回
back to the x-bar in every time period.

到x拔
But then there's new noise that adds onto it.

然后会出现新的白噪声项
If there were no new noise,

如果没有新的白噪声项