Hi,
using the (plug) tool I added to the latest version of Pfscan I've looked at some 30,000 P&F trades from the FT350 and S&P500 going back to the start of the tech crash. Before going further I'll make the point that I think P&F traditional methods suit LTBH more, and a 'good' trade can also start off with a bad dip at some point that any trailing stop method will exit on.... if you are prepared to set a BIG initial stop, unlike me, you might find overall hit rates improve - old studies give 70% good calls as typical for P&F. which I can only find by filtering for specific short trades.
Overall, and this is fairly preliminary analysis, it looks to me like you can expect a system built on P&F signals to return around 50-55% winners, some percentages drop to mid 40's, others up to around 60. This is based on a system that buys at the close on the signal day, sells at close on sell date, and runs a trailing stop to signal exits. By adding further factors such as exits on the daily bars moving for x days against the trade, the P&F changing bull:bear etc, the percentages alter a little.
The average hold of these 'automatic trades' varies, but is in the 25-35 day range usually.
Comments: I purposefully adopted a conservative way of assessing this stuff - the data dump with signal info contains a 'peak price' showing you the 'best' price hit by the trade between buy and sell dates... the profit on ALL trades was around 3-5% average, using the entry/exit prices rather than the 'best' price... active management of exits could therefore get you closer to the 'best' return, which ran from around 9% to 12% average per trade. So if you were really good, then you'd have made 30,000 trades, and averaged say 10% profit across them all. (Not just the winners), in the course of 4 years.
Better statisticians than I can no doubt make more of this, I only scratched the surface, and want to expand this area of Pfscan to add filters to that 'exit selector' form to allow users to explore their trade management strategies. As I remain convinced that profit results from managing positions better, and the 'hit rate' matters less, then I find the initial numbers encouraging - NO block of trades using all the different filters I've tested ended up losing, although the profits are sub 5% generally. Not bad for a purely mechanical system though, especially at the first attempt.
Dave