Difference % between PRICE and VWAP

# Difference % between PRICE and VWAP
# Assembled by BenTen at useThinkScript.com
# Converted from https://www.tradingview.com/script/o0mHbrYo-Difference-between-PRICE-and-VWAP-V2/

declare lower;

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;

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));

def VWAP = price;
def UpperBand = price + numDevUp * deviation;
def LowerBand = price + numDevDn * deviation;

input src = close;
input len = 36;

def xSMA = vwap;
def nRes = absValue(src - xSMA) * 100 / src;

def nRes3 = simpleMovingAvg(nRes, len);

plot avg = nRes3;

input level1 = 1.28;
input level2 = 2.1;
input level3 = 2.5;
# input level4 = 3.09;
# input level5 = 4.1;

plot ZeroLine = 0;
plot histogram = nRes;

plot l1 = level1;
plot l2 = level2;
plot l3 = level3;
# plot l4 = level4;
# plot l5 = level5;

histogram.SetPaintingStrategy(PaintingStrategy.HISTOGRAM);