Many thanks to all for your thoughts and contributions. As I have said repeatedly, I have no doubt whatsoever that there are trends and that such trends are caused by supply and demand in the economy and human behaviour. I do not believe in the EMH. I do not believe that the markets are a markov chain. I believe that there is autocorrelation in markets for periods of time as participants adjust to ongoing economic reality and herd instinct.
What I do believe however is that these trends have become increasingly difficult to follow and profit from using mechanical systems in the recent past. Analysis of autocorrelation, of the profitability of trend following systems, of the âefficiencyâ of trends all point in the same direction.
Such analysis is confirmed in the real world by the effective collapse of the methods of various long term trend followers in the mid 2000s: Dunn and JWH were lead to near ruin, Abraham and a slew of others were forced back to the drawing board and made changes to their portfolios and their systems.
2011 and 2012 wrought similar havoc among trend following CTAs. And a similar rush of head scratching.
So the purpose of this thread was not to deny that trends exist nor to claim that it is impossible to benefit from them financially through the use of systematic trading. It was to provoke thought on how systems might survive into the future and continue to benefit from trends, while avoiding being destroyed by noise and sideways choppy markets.
Some believe that trend following systems can be turned on during trending periods and counter trend systems can be turned on during choppy, sideways markets and vice versa. Some believe that running a multitude of different systems at the same time will enable the program as a whole to profit from any market condition.
I have made much the same request for discussion in a number of different forums with widely varying results. An anonymous well wisher on Nuclear Phynance made the following helpful suggestion: âIMO this thread belongs to trash.â Some kind souls have, as usual, heaped derision on my efforts and responded with scorn and unpleasantness. Others seem to wish to take anything I say as a personal insult and feel the necessity to respond in a like manner.
Happily, the majority take what I say in the spirit in which it is intended. Riccardo Ronco for instance instead pointed to useful and interesting research papers. To all of those, thank you for your contributions.
What I do believe however is that these trends have become increasingly difficult to follow and profit from using mechanical systems in the recent past. Analysis of autocorrelation, of the profitability of trend following systems, of the âefficiencyâ of trends all point in the same direction.
Such analysis is confirmed in the real world by the effective collapse of the methods of various long term trend followers in the mid 2000s: Dunn and JWH were lead to near ruin, Abraham and a slew of others were forced back to the drawing board and made changes to their portfolios and their systems.
2011 and 2012 wrought similar havoc among trend following CTAs. And a similar rush of head scratching.
So the purpose of this thread was not to deny that trends exist nor to claim that it is impossible to benefit from them financially through the use of systematic trading. It was to provoke thought on how systems might survive into the future and continue to benefit from trends, while avoiding being destroyed by noise and sideways choppy markets.
Some believe that trend following systems can be turned on during trending periods and counter trend systems can be turned on during choppy, sideways markets and vice versa. Some believe that running a multitude of different systems at the same time will enable the program as a whole to profit from any market condition.
I have made much the same request for discussion in a number of different forums with widely varying results. An anonymous well wisher on Nuclear Phynance made the following helpful suggestion: âIMO this thread belongs to trash.â Some kind souls have, as usual, heaped derision on my efforts and responded with scorn and unpleasantness. Others seem to wish to take anything I say as a personal insult and feel the necessity to respond in a like manner.
Happily, the majority take what I say in the spirit in which it is intended. Riccardo Ronco for instance instead pointed to useful and interesting research papers. To all of those, thank you for your contributions.

