這個要感謝 ptt.cc 的前經濟板板主 publius 的分享.
如果學過計量經濟學, 應該會清楚的知道這篇的賣點. XD!
A student was sitting in an econometric class taught by Prof White.
The lecture was too difficult that few students understood it.
"What is the lecture all about?"
A student asked his friend who was sitting right next to him.
"I don't quite understand it either.
All I get is, it's just some noise...specifically, white noise.
He said we can expect it to be nothing on average."