Then if the market goes further down exit all (GTFO exit).
Looks like this system trader is doubting his system. IMO an index filter is a real tricky thing to include in a momentum trading system. The main reason is deciding what parameters to use with the index. If the period is too small then one down week can turn it off. This gets us out of the market quickly but this may be premature and triggered by what turns out to be a normal dip in a bullish market. If the parameter is too long, then we lose too much of our open profit and we're late into the next bullish rally.
The system trades bullish momentum in individual stocks. Stocks most in demand start moving first and it's their movement that causes the index to move. Stocks make the index move, yet in our mom system we place the cart before the horse and wait for the index to move before trading individual stocks. It doesn't make sense (to me).
I was never comfortable with any parameter I chose for the index and that's why my index filter doesn't turn the trading system off/on. I use it as a warning indicator to reduce/increase portfolio heat. @rnr made a valuable comment that his index filter indicates which setups to use.
I've no doubt that your (@Warr87 ) portfolio holds many positions that are losing money. Why don't you sell all the biggest losers when the index filter triggers this action. Then if the market goes further down exit all (GTFO exit). If the market rallies (just an ugly dip) then you're still partially invested and have capital to buy the stronger stocks.
I understand that you can't make any changes without testing and I agree this is the correct course of action. I also know that discretionary ideas are also very hard to code. The ideas that I've suggested CAN be coded if you think they have potential to improve performance.
It's times like these that I wish I could show you with back testing results how valuable these ideas are. I've only got 15 years trading experience to know that they are.
@Skate 's stale exit is only one way a portfolio can be kept in the strongest momentum moves. Selling the weakest stocks first at the early signs of market bearishness is another way.
Rotational momentum systems always ensure the portfolio is filled with the strongest movers. They cull the slowest movers in the portfolio (even if price is going up).
I was never comfortable with any parameter I chose for the index and that's why my index filter doesn't turn the trading system off/on. I use it as a warning indicator to reduce/increase portfolio heat. @rnr made a valuable comment that his index filter indicates which setups to use.
In my experience an index filter is only good for systems that have a longer term hold time. I also trade a short term swing system (average hold time 3 days) and any type of index filter is completely useless and really kills performance of the system.i've backtested using specific filters and got better results with the XAO as a filter. I guess it depends on your system. I agree that just using the XAO for the sake of using the XAO isn't the best approach.
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