I use this for calculating Bollinger bands:

        Period eetDaily = Period.createCustomPeriod(Unit.Day, 1, JFTimeZone.EET);
        this.dailyFeedDesc = new TimePeriodAggregationFeedDescriptor(myInstrument, eetDaily, OfferSide.BID, Filter.ALL_FLATS);

...

        Object[] bb1_2 = this.indicator.calculateIndicator(dailyFeedDesc, new OfferSide[]{OfferSide.BID}, "BBANDS",
                new IIndicators.AppliedPrice[]{IIndicators.AppliedPrice.CLOSE},
                new Object[]{20, 1.0, 1.0, IIndicators.MaType.SMA.ordinal()}, 3);

        double middleValue2 = (double) bb1_2[1];

My platform and chart is set up accordingly, but the values are a bit different. For example (middle line value):
-right value (on chart): 1.01193 (I calculated it manually too)
-wrong value (strategy): 1.00943

The candlesticks are all the same on chart and the strategy, I have checked it.

I also checked this page: https://www.dukascopy.com/wiki/#Indicato ... _checklist

Has anybody any idea why this can happen?

Thank you

Hi,

As always, it is easier to see/check/test what is going on, if you attach a sample strategy that replicates the case.

I don't know if the BBand indicator using unstable period, but if it is, that might be the reason for the slight difference.
Take a look on this topic where we talk about the unstable periods in general, and how it is affecting indicator calculation.

IndicatorInfo can be use to check if an indicator is using unstable periods. You can start with that.

We were unable to reproduce this problem. It could be helpful if you provided full example strategy.
1) Please check that you have set correct date start time:


2) Note that BBANDS default parameters are (20, 2,2, EMA) but strategy uses (20, 1, 1, SMA)
3) Also make sure filter ALL_FLATS is selected in settings.