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Hi Pete, How is it possible to create a Multi-time frame Bollinger bands? That line that I have commented out is an issue. I appreciate your help! input length = 20; input Num_Dev_Dn = -2.0; input TimeFrame = AggregationPeriod.DAY; ####def sDev = stdev(data = price(period = TimeFrame)[-displace] length = length); plot MidLine = MovingAverage(averageType, data = price[-displace], length = length); LowerBand.SetDefaultColor(GetColor(0));
RESOLVED
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There is much more to it than the line you have commented out. But in order to correct that line so that is works correctly you need to use the actual close in place of the input named “price”:
Next, you need to apply the secondary aggregation period to the moving average that forms the middle line:
After making both of these adjustments you should find that it works as expected. But it’s late. And I did not bother to fire up Thinkorswim and test it. So let me know if you still get errors and I’ll address them in the morning. Marked as spam
 Posted by Pete Hahn (Questions: 37, Answers: 4118) Answered on June 23, 2018 9:25 pm
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Thanks Pete. I tried this, but unfortunately, it still comes up with an error on that first line that you edited.
Yes. That is because of a missing comma. I only copy and pasted your code and corrected the reference to the secondary time frame. Here it is with the comma in its proper place. I will fix this in my original answer when I get back to my computer.
def sDev = stdev(data = close(period = TimeFrame)[-displace], length = length);
Thanks Pete, that worked!