http://img218.imageshack.us/i/202l.png/
http://img267.imageshack.us/i/283.png/
Columbus, that's why I mentioned something to the effect of plotting the 20 and 28 on your demo account. 28 may seem to wide, but it takes into account the full cycle (Which sometimes can be up to 32 and even 34.). The 20 has a lot of action with the candles riding on the upper or lower bands, which, IMO, renders the bands useless.
Also, I prefer the 28,3 over the 28,2, because 3 sigma is more extreme and less likely to be hit, which renders a better trading opportunity.
Attached, are a couple of charts of the GBP/USD. One with the 28,3, and the other with the default, 20,2. The rule with the 28,3 is to wait for the break from the band, then enter going the opposite direction, and wait for at least the mean to be hit. Or, if the extremity is exceeded, then wait for the candle opposite the direction it is traveling in (E.g--Bear candle in an uptrend.), then enter the trade.
Also, notice how much more stable the 28 is. This is because of the measure of the trend, itself. The 20 oscillates all over because it does not account for the entire movement of the whole trend.
If there are too many candles accounted for, then it does not oscillate enough. In other words, it is too stable (e.g-plot the 100).
I believe in using the BB's, you want an indicator that will measure the movement of a trend once it has gotten to an extreme condition, so you can place a trade going the opposite direction in order to optimize the most profit from it.
BTW, nice charts in showing the normal distribution of the SD's. There is one slight difference. There is a greater percentage of sigma 1 and sigma 2 being hit, because this is a constant move SD. It is not arbitrary data, as an example, the height of all men in a classroom. So, the 68% ( 1 sigma), 95% (2 sigma), and 97% (3 sigma) will be much less. That is easy to test. Just plot 100 candles, then add up the times the 1'2, 2's, and 3's are hit.
http://img267.imageshack.us/i/283.png/
Columbus, that's why I mentioned something to the effect of plotting the 20 and 28 on your demo account. 28 may seem to wide, but it takes into account the full cycle (Which sometimes can be up to 32 and even 34.). The 20 has a lot of action with the candles riding on the upper or lower bands, which, IMO, renders the bands useless.
Also, I prefer the 28,3 over the 28,2, because 3 sigma is more extreme and less likely to be hit, which renders a better trading opportunity.
Attached, are a couple of charts of the GBP/USD. One with the 28,3, and the other with the default, 20,2. The rule with the 28,3 is to wait for the break from the band, then enter going the opposite direction, and wait for at least the mean to be hit. Or, if the extremity is exceeded, then wait for the candle opposite the direction it is traveling in (E.g--Bear candle in an uptrend.), then enter the trade.
Also, notice how much more stable the 28 is. This is because of the measure of the trend, itself. The 20 oscillates all over because it does not account for the entire movement of the whole trend.
If there are too many candles accounted for, then it does not oscillate enough. In other words, it is too stable (e.g-plot the 100).
I believe in using the BB's, you want an indicator that will measure the movement of a trend once it has gotten to an extreme condition, so you can place a trade going the opposite direction in order to optimize the most profit from it.
BTW, nice charts in showing the normal distribution of the SD's. There is one slight difference. There is a greater percentage of sigma 1 and sigma 2 being hit, because this is a constant move SD. It is not arbitrary data, as an example, the height of all men in a classroom. So, the 68% ( 1 sigma), 95% (2 sigma), and 97% (3 sigma) will be much less. That is easy to test. Just plot 100 candles, then add up the times the 1'2, 2's, and 3's are hit.
Good points mentioned you.
As far NIFTY goes BB(20,2) is defacto standard.
I think FOREX needs BB(28,3).
There 2 ways to change the width of the bands.Take a higher simple average
20,28,.....Or increase the Time Frame.
Certainly I will keep in mind BB(28,3).