Something to keep in mind, the indicator needs a certain amount of data to begin calculations. Whatever 'Period' you input for the indicator, its needs a minimum of that many bars on the chart before it even begins calculating, this is there to avoid trying to calculate data based on a bar index that doesn't exist.
So that means if you input a period of 2000, you need a MINIMUM of 2001 bars on the chart before the indicator makes it's first calculation. So if you like to look at 3000 days with a 'Period' of 2000 for example, you know those FIRST 2000 bars, the indie WILL NOT perform any calculations as it needs at least that many bars to perform the bollinger calculation.
SO if you put 3650 days on your chart and set your 'Period' to 2000, you won't see any calculations for the indicator during those first 2000 bars. If you want to see the values for those bars, then you need more days loaded on your chart.
Try taking that into account and lemme know if the problem still persists. I'll add some more lines on it after you lemme know if you get things working the way you want.
Last edited by forrestang; September 22nd, 2011 at 08:29 AM.
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@forrestang - now tried the indicator out - works fine. Still a little confused about the short chart drawing because the standard BB indicator does n't have that behavior, but I can certainly live with it. Thanks very much and if you feel like adding a 4th band sometime that would be great
I think you probably have figured it out, but just in case.......
Well, for the 'short drawing,' think about it this way, if you were told to calculate a moving average based on 20 bars by hand, how could you calculate it if you only had 10 bars and not a full 20? You could fit an approximation in there, but your calculation WOULD NOT be an ACTUAL 20 period moving average. It would be a 10 bar moving average.
So what the study is doing, is WAITING until it has a minimum of whatever period YOU input as a PERIOD. Once it has that many bars + 1, that is when the study starts performing a calculation.
Here is the study with the 4th band added, renamed for simplicity.
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