The part I liked the most is the Michael Jordan quote. I didn't know MJ so statistical, and now I respect him a lot more.
A trader should do the same. A simple system of logging trading decisions like MJ did will greatly help a trader improve.
I always wish there are some web app that logs what those pundits (stocks or whatever) said, and keep a tab of their accuracy.
In a similar vein, WSJ had a very clever "dartboard contest" for years. (http://www.investorhome.com/darts.htm) Unfortunately, it requires a subscription to see the results. You might find it interesting if you have one.
SPY = S&P500 Index ETF. That was actually a minor error on my part. I meant to link you to a comparison of BRK-A versus the SP500 index, not an trust that tries to mirror the SP500 index. Thankfully, for comparative purposes, they are virtually identical.