Testing across symbols saved me from a one-stock strategy!
I had something that worked beautifully. On one name. For one quarter.
Now I split results by symbol before I get excited. If the profit comes from two tickers out of thirty, that's not a strategy, that's a story about two tickers, and there's no reason to believe those two will keep behaving that way.
The version that survived symbol-splitting was much less impressive and much more real. Boring beats fragile!
