Hi, The timePeriod is a number of subsequent values before the indicator calculating reference point. For instance, we have EMA indicator with time period of 20. To calculate a value, it requires 20 subsequent prices before the indicator calculating reference point. Please, take a look at the attached picture. Please consider also this https://www.dukascopy.com/swiss/english/forex/jforex/forum/viewtopic.php?f=5&t=2345
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