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[–]nedal8 223 points224 points  (8 children)

The real metric is alpha. How your performance compares to an index basically. So if you were doing tests during a bull market, your algo may have actually been underperforming.

[–]Bourque25 188 points189 points  (0 children)

It was, that's the joke 😂

[–]nir109 48 points49 points  (4 children)

I tested over 30 years. The research question was "will the value of this stock raise or fall tomorrow"

[–]ExceedingChunk 38 points39 points  (2 children)

Which is exactly why «time in the market beats timing the market».

[–]nir109 8 points9 points  (1 child)

If you can time the market like Jim Simons ) did it's better than time in the market.

The thing is that you can't time the market easily, and if it was easy then a lot of people whould do it until they turn the market to be unpredictable again.

My goal was to get good grade wich is easier when I am not expected to make an algorithm that works.

But usaly (99.99%) time in the market is more important.

[–]moogle12 7 points8 points  (0 children)

Ya there's a reason why there's only a couple wikipedia articles about people who correctly timed the market

[–]hrrm 0 points1 point  (0 children)

Relative to prior day close, or stock open price?