Overlay · vwapbands
What it computes
VWAP from the first loaded bar, with volume-weighted standard-deviation bands StdDev either side.
It describes bars that have already printed. QuantZ does not claim this indicator has predictive value, and it is not a recommendation to do anything.
Inputs and lookback
- StdDev · default 2
Reads open, high, low, close and volume from the loaded bars. The first value appears once the longest lookback its parameters name has elapsed; earlier bars are left empty rather than padded.
What it assumes about the series
- Bars arrive oldest to newest at one interval, each with a finite open, high, low and close. The input is the chart’s loaded series, whatever its length.
- The function is given bars, not sessions: it does not know the timeframe, where a session opens, or that a gap in the tape is a gap.
- Warm-up bars are omitted rather than padded. The first value appears once the arithmetic has enough history, and nothing is drawn before it.
- The newest bar is the forming bar. Its value uses the live close and settles when the bar closes.
- Each bar carries a volume field. A feed that reports no volume produces no line at all rather than an invented one.
- Anchored at the first loaded bar rather than at a session open: the function is given bars, not sessions.
- Cumulative from the first loaded bar: the level is relative to where the loaded history starts, so only its changes carry meaning, and loading more history moves the whole line.
Whether a drawn value can change
forming-bar · Moves only on the forming bar. The newest bar’s value moves with its live close until that bar closes. A closed bar’s value is final and is not redrawn when later bars arrive.
This class is read from the registry entry and checked by a test against the function itself: for a class that says closed bars are final, appending a bar must leave every earlier point unchanged, and for a class that says they are not, it must not.
Outside its inputs
- Nothing outside the loaded bars: no longer history than the chart has loaded, and no other interval.
- Nothing inside a bar: no individual trades, no order book, no bid or ask.
- No other symbol, no benchmark, no news, no fundamentals, no earnings dates.
- Volume is the bar’s total. Which side of the book it traded on is not in the data.