The Relative Strength Index (RSI), developed by J. Welles Wilder in 1978, is a bounded momentum oscillator. It compares the magnitude of recent up-closes to the magnitude of recent down-closes over a look-back window (Wilder's default is 14) and rescales the result onto a 0–100 axis.
Conventional reads: above 70 = overbought, below 30 = oversold. In strongly trending markets those thresholds shift (Constance Brown's work argues 40–80 for uptrends and 20–60 for downtrends). RSI is also used to spot divergences — price makes a new high but RSI does not, suggesting weakening momentum.
Wilder used a smoothing scheme equivalent to an EMA with α = 1/N, not the standard EMA α = 2/(N+1). Different platforms use slightly different smoothing, so RSI values can disagree across charting tools.
Formel
RSI = 100 - 100 / (1 + RS), where RS = avg gain / avg loss over the look-back window
Beispiel
Over 14 bars: average gain = 1.2, average loss = 0.6. RS = 2.0, RSI = 100 − 100 / 3 ≈ 66.7 — leaning bullish but not overbought.
Wie Noon Barbari Relative strength index (RSI) nutzt
Jedes Konzept hier ist in der Plattform umgesetzt. Öffne die entsprechenden Docs oder das Tool, um es in Aktion zu sehen.
See the indicators reference →Verwandte Begriffe
- Indikatoren
MACD
Trend-momentum hybrid: difference of two EMAs, plus a signal-line EMA and histogram.
- Indikatoren
Stochastic oscillator
Where today's close sits inside the high-low range of the last N bars, 0–100.
- Indikatoren
Moving average
A rolling average of price over a fixed window, used to smooth noise.
- Marktstruktur
Trend
A persistent directional drift in price — up, down, or sideways.