#
# TD Ameritrade IP Company, Inc. (c) 2011-2022
#
# Adjusted VWAP indicator to use price as close instead of vwap so that this approximate version of the VWAP indicator will plot on Range charts.
input numDevDn = -2.0;
input numDevUp = 2.0;
input timeFrame = {default DAY, WEEK, MONTH};
def cap = GetAggregationPeriod();
def errorInAggregation =
timeFrame == timeFrame.DAY and cap >= AggregationPeriod.WEEK or
timeFrame == timeFrame.WEEK and cap >= AggregationPeriod.MONTH;
Assert(!errorInAggregation, "timeFrame should be not less than current chart aggregation period");
def yyyyMmDd = GetYYYYMMDD();
def periodIndx;
switch (timeFrame) {
case DAY:
periodIndx = yyyyMmDd;
case WEEK:
periodIndx = Floor((DaysFromDate(First(yyyyMmDd)) + GetDayOfWeek(First(yyyyMmDd))) / 7);
case MONTH:
periodIndx = RoundDown(yyyyMmDd / 100, 0);
}
def isPeriodRolled = CompoundValue(1, periodIndx != periodIndx[1], yes);
def volumeSum;
def volumeVwapSum;
def volumeVwap2Sum;
def vwap = close;
if (isPeriodRolled) {
volumeSum = volume;
volumeVwapSum = volume * vwap;
volumeVwap2Sum = volume * Sqr(vwap);
} else {
volumeSum = CompoundValue(1, volumeSum[1] + volume, volume);
volumeVwapSum = CompoundValue(1, volumeVwapSum[1] + volume * vwap, volume * vwap);
volumeVwap2Sum = CompoundValue(1, volumeVwap2Sum[1] + volume * Sqr(vwap), volume * Sqr(vwap));
}
def price = volumeVwapSum / volumeSum;
def deviation = Sqrt(Max(volumeVwap2Sum / volumeSum - Sqr(price), 0));
plot VWAP_ = price;
plot UpperBand = price + numDevUp * deviation;
plot LowerBand = price + numDevDn * deviation;
VWAP_.SetDefaultColor(GetColor(0));
UpperBand.SetDefaultColor(GetColor(2));
LowerBand.SetDefaultColor(GetColor(4));