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."
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