Incorrect Bollinger Values with BarsAgo indexing

[radhmu978]

Dear NT8 Support team,


I'm calculating the Bollinger values for current bar and past 2 period bars, but I get incorrect values. When I try to go back to historical bar using "int barsAgo" and calculate the Bollinger values, I'm not getting the correct number? Could you please check?

Bollinger(ISeries<double> input, double numStdDev, int period).Lower[int barsAgo]
Bollinger(ISeries<double> input, double numStdDev, int period).Upper[int barsAgo]

//bollinger for 15 min time frame - current or recently closed bar
bollingerALT = (Bollinger(BarsArray[1],2,8).Upper[0] - Bollinger(BarsArray[1],2,8).Lower[0]);
bollingerUpLT = Bollinger(BarsArray[1],2,8).Upper[0];
bollingerBLT = Math.Round((bollingerALT / bollingerUpLT) * 100, 2);


//bollinger for 15 min time frame - barsAgo[2]
bollingerALT = (Bollinger(1, 14).Upper[2] - Bollinger(1, 14).Lower[2]);
bollingerUpLT = Bollinger(1, 14).Upper[2];
bollingerBLT = Math.Round((bollingerAST / bollingerUpST) * 100, 2);
Print(string.Format("{0} | Time[2]: {1}, Bollinger Value [2]:{2}", Time[0], Time[2], bollingerBLT));

#### Output ####

3/14/2022 9:00:00 PM - Current bollinger -15 min time frame - 0.27
3/14/2022 9:00:00 PM | Time[2]: 3/14/2022 8:30:00 PM, Bollinger Value [2]:0.21

3/14/2022 9:15:00 PM Current bollinger -15 min time frame - 0.27
3/14/2022 9:15:00 PM | Time[2]: 3/14/2022 8:45:00 PM, Bollinger Value [2]:0.21

3/14/2022 9:30:00 PM Current bollinger -15 min time frame- 0.33
3/14/2022 9:30:00 PM | Time[2]: 3/14/2022 9:00:00 PM, Bollinger Value [2]:0.2

3/14/2022 9:45:00 PM - Current bollinger -15 min time frame- 0.49
3/14/2022 9:45:00 PM | Time[2]: 3/14/2022 9:15:00 PM, Bollinger Value [2]:0.3

3/14/2022 10:00:00 PM Current bollinger -15 min time frame- bollingerBLT - 0.54
3/14/2022 10:00:00 PM | Time[2]: 3/14/2022 9:30:00 PM, Bollinger Value [2]:0.37

[NinjaTrader_Jesse]

Hello radhmu978,

I am not certain I understand the question in contrast to the prints. Are you saying that one of the actual Bollinger values is not correct in some way?

Do you have a more simple example that does not involve the math you are printing out?

[radhmu978]

this is an issue with BarsAgo index. If i go back based on historical Bars, I'm not getting the right values


Bollinger(ISeries<double> input, double numStdDev, int period).Lower[int barsAgo]
Bollinger(ISeries<double> input, double numStdDev, int period).Upper[int barsAgo]

[NinjaTrader_Jesse]

Hello radhmu978,

I understand that part of the concern however I don't understand the question with the print you provided. Are you seeing the BarsAgo on one of the Bollinger's is not working as expected? The math would need to be removed from the sample to see the base indicator values.