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How much data is needed?
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How much data is needed?

  #1 (permalink)
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How much data is needed?

When developing an automated strategy, in your opinion, how much historical tick data would you need in order to feel comfortable with the results? This particular strategy is an automated scalping strategy trading off of Euro tick data.

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  #3 (permalink)
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watching some documentary where they criticized LTCM for backtesting only 5 years of data. had they backtested a bit more they could get a "feel" of the 1987 black monday.

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You need to also factor in the frequency of trades.

For my backtests, I look for the strategy to trade at least 3-5 times a day and I optimize over at least 2 years of tick data. It is still very easy to over curve fit to data, but strategies that only trade once a day or once a week, etc, are obviously much easier to curve fit.

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bukkan View Post
watching some documentary where they criticized LTCM for backtesting only 5 years of data. had they backtested a bit more they could get a "feel" of the 1987 black monday.

Which documentary? I like watching this type of stuff.

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Big Mike View Post
Which documentary? I like watching this type of stuff.

Mike

sorry, dont remember the name.

same here. love to watch movies and docu on trading.

have a peep here. some nice series. YouTube - DarkAngelStarQ's Channel

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Backtesting

I loved the video. I saw the movie that CNBC put out re: the Lehman collapse but I think the youtube video was even better. Anyway, the automated trading that I am doing places between 3 and 5 trades per day. That said, it sounds like I need to back test against 2 or more years of data.

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bukkan View Post
watching some documentary where they criticized LTCM for backtesting only 5 years of data. had they backtested a bit more they could get a "feel" of the 1987 black monday.

They were backtesting on daily data. 5 years of data is equivalent to 1250 bars. This is insufficient anyway. 1 week of 5 min data of ES would be 1395 bars, which is about equivalent.

If the strategy makes 3 trades per day and you have two years of intraday data, then this would be roughly 1500 trades (750 per year), which is a good base. You can then divide the data into your backtest and the walk forward sample.

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