Alain, for the second question.
there are all kind of market conditions. It's easy to show that.
take your system and pick randomly stocks, futures and bonds. (several of each, and different not correlated ones!).
If you have a system working with ALL with the same performance (relatively to the market's volatility of course), then you have the holy grail.
chances are it does not work.
if not, these represents the 'different market conditions'.
difference in volatility, acceleration, noise to move ratio, trending or not trending, small or big day range etc...
there are all kind of market conditions.
also, a trend following system can fail because the timeframe you trade suddenly is not trending, but there is ALWAYS a trend at any given time (otherwise the chart would be a flat line).
and yes, you can build a meta system capable of switching itself in different modes. however my experience is that separating the systems is better strategy. it allows better analysis. even a meta system won't work all the time because there are so many markets behaviours while a meta system is more difficult to maintain and debug.
tntneo
there are all kind of market conditions. It's easy to show that.
take your system and pick randomly stocks, futures and bonds. (several of each, and different not correlated ones!).
If you have a system working with ALL with the same performance (relatively to the market's volatility of course), then you have the holy grail.
chances are it does not work.
if not, these represents the 'different market conditions'.
difference in volatility, acceleration, noise to move ratio, trending or not trending, small or big day range etc...
there are all kind of market conditions.
also, a trend following system can fail because the timeframe you trade suddenly is not trending, but there is ALWAYS a trend at any given time (otherwise the chart would be a flat line).
and yes, you can build a meta system capable of switching itself in different modes. however my experience is that separating the systems is better strategy. it allows better analysis. even a meta system won't work all the time because there are so many markets behaviours while a meta system is more difficult to maintain and debug.
tntneo
