splashy
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I see your point but one only knows its extreme data after the fact. So last monday for instance one has placed one's BB trade and the day turns out to be volatile. You couldn't know in advance how volatile the day would be and so one couldn't know that one wouldn't trade those conditions. Moreover we have no idea if changes in volatility represent a short term change or are the beginnings of a longer term change in behaviour.
The BB system does have some protection against unusual volatility by not trading if the BBr is greater than x% of the ATR. But if push comes to shove change the system not the data.
Lol. We do agree, Bartleby, but we're coming at it from different angles. I took from your original post re ATR that the system had ground to a halt because of the extreme volatility. To me, that means that you couldn't trade the system(as opposed to 'decided not to'), and so the data collected couldn't be useful and shouldn't be included. Of course, if the system itself is then altered so that such volatility can be traded, then that data becomes valid (whether you decided to trade or not).
I didn't mean to infer that selected data should be ignored, just that you cannot build a system around data if the system itself can't achieve it.
Btw, i haven't found that high levels of ATR is an obstacle to profit on BB. Some big targets might not get hit but they quite often get half way there and net 40 pips or so, probably for exactly the reasons you laid out in your first paragraph.
Whatever, the more data, the better the system...