Oscillator · dymi
What it computes
Wilder’s RSI of closes over a length that changes every bar: Length divided by the ratio of the StdDev-bar standard deviation of closes to its Average-bar mean, rounded down and held between Min and Max, bounded 0 to 100.
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
- Length · default 14
- StdDev · default 5
- Average · default 10
- Min · default 5
- Max · default 30
Reads the close of each loaded bar. With the default settings the first value is on bar 31; 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.
- While the newest bar is still forming, its value uses the live close and moves until the bar closes.
- A recursive average: it is seeded from the first loaded bars, so the earliest drawn values reflect the seed more than the tape, and loading more history changes them. The dependence fades as more bars arrive.
- The gain and loss averages are seeded once, over the length in force on the first drawn bar, then smoothed by one over each bar’s own length — the variable-length RSI of Chande and Kroll’s published code.
- Nothing is drawn until Max bars of changes exist, so the longest length the rule can reach is always available.
- A window with no movement at all makes the volatility ratio 0/0; it is taken as 1, so the length is Length.
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. Appending later bars leaves closed-bar values unchanged. Loading older history or correcting input bars can change them; each entry states its history assumptions.
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 not read at all.