Why
A beginner's first RSI mistake is treating 70 and 30 like fixed rules: sell everything above 70, buy everything below 30. In a ranging market that works reasonably often; in a trending market it is close to the worst possible rule, because a strong trend can push RSI above 70 and hold it there for weeks while price keeps climbing. Selling the first overbought reading in a strong uptrend means exiting a winning position early and often re-entering higher. The fix is not to ignore RSI but to read it as two separate signals: the level, which says something about momentum relative to its own recent history, and the shape, meaning divergence between RSI and price, which is a genuinely useful early warning if treated as a warning and not a trade trigger by itself.
How it works
The formula
RSI = 100 − 100 / (1 + RS), where RS is the Wilder-smoothed average of up-closes divided by the Wilder-smoothed average of down-closes over the lookback period, 14 by default. Wilder's smoothing is not a simple moving average; it weights recent bars more like an exponential moving average with roughly a 1/14 smoothing factor, so RSI reacts faster to new bars than a plain 14-bar average would and does not require storing the full lookback window. The practical result: 14-period RSI needs at least 14 closed bars to settle, and its value depends on which timeframe's bars you are computing it on.
Overbought, oversold, and why the meaning shifts with the regime
70 and 30 are the textbook overbought/oversold bands; some traders use 80/20 for fewer, higher-conviction signals, or tune the band width to the instrument's volatility. A rule of thumb, popularized by Constance Brown and widely repeated but not part of Wilder's original text, is that RSI's effective range shifts with the trend regime: in a sustained bull market RSI tends to oscillate roughly between 40 and 80–90, using the 40–50 zone as support on pullbacks rather than falling into oversold; in a sustained bear market it tends to oscillate roughly between 20 and 60, with 50–60 acting as resistance on bounces. Read that as "where does RSI find support and resistance on this chart lately," not as a hard number — it is a pattern to check against the actual chart, not a substitute for looking at it.
Divergence: regular vs. hidden, warning vs. trigger
Regular (classic) divergence is the reversal warning: price makes a higher high while RSI makes a lower high (bearish), or price makes a lower low while RSI makes a higher low (bullish) — momentum is not confirming the new price extreme. Hidden divergence points the other way and favors trend continuation: price makes a higher low while RSI makes a lower low during an uptrend pullback (bullish hidden), or price makes a lower high while RSI makes a higher high during a downtrend bounce (bearish hidden). Both are warnings, not triggers — a divergence can persist or fail for several more bars before price actually turns, so the standard practice is to wait for a price confirmation, a broken trendline, a lower low undone, a candle pattern, before acting on it, rather than entering on the divergence alone.
On TradingView
Add it from Indicators (the "fx" icon on the top toolbar) → search Relative Strength Index → select it; it opens in its own pane below the price chart. Open its settings with the gear icon: the Inputs tab has Length (the lookback, default 14) and Source (default close); the Style tab lets you edit the Upper Band and Lower Band values (default 70/30) and toggle the background fill between them. To draw a trendline on RSI itself, click the RSI pane first so it is the active chart, then pick Trend Line from the left drawing toolbar and connect RSI peaks or troughs the same way you would on price — comparing the slope of that line to a trendline on price is how you spot divergence by eye. To add a moving average on RSI, open the indicator's settings and look for the smoothing section (MA Type and MA Length, with an optional Bollinger Bands standard-deviation field); enabling it plots a moving average line directly on the RSI series, which some traders use for MA-cross signals on momentum the same way they would use a price MA cross.
Where it lands in Jayverse
- Number: RSI as a momentum column, not a signal generator. Any indicator readings distributed through Number should log both the RSI value and its lookback and timeframe, and never emit a bare "overbought/oversold" flag without the trend context; a reader acting on the flag alone is the mistake this item exists to prevent.
- Verex: momentum indicators stay out of resolution. RSI and other oscillators are useful for market-maker inventory judgment but have no place in a resolution field; resolution needs a reference rate or a named venue price, not a derived momentum reading.
- The Auditor: log the RSI parameters, not just the reading. If a research note cites "RSI overbought," the Auditor row should record length, timeframe and band values used, since a 14-period RSI on the daily and a 6-period RSI on the 5-minute chart are not comparable claims.
- Theory: RSI is a bounded transform of returns. It sits next to the log-returns and volatility items as a worked example of turning a raw price series into a bounded, comparable number, useful groundwork before touching more model-heavy indicators.
Verified and unverified
Verified: Wilder's original formula and 14-period default, the 70/30 convention, and the definitions of regular and hidden divergence are standard technical-analysis material, documented in TradingView's Help Center and in Wilder's own writing. Unverified or a rule of thumb: the specific 40–80/20–60 range-shift numbers, the practice associated with Constance Brown, are a widely cited pattern rather than a fixed law, and vary by instrument and author; treat them as a starting point to check against the chart, not a rule.
Sources: TradingView Help Center (Relative Strength Index) · J. Welles Wilder, New Concepts in Technical Trading Systems · John J. Murphy, Technical Analysis of the Financial Markets · Constance Brown, RSI range-shift concept as commonly cited in technical-analysis literature.
Key expressions
| Expression | 뜻 · 쓰이는 자리 |
|---|---|
| RSI (Relative Strength Index) | 상대강도지수 · 0~100 사이 모멘텀 오실레이터. "The Relative Strength Index (RSI) is a momentum oscillator" |
| momentum oscillator | 모멘텀 오실레이터(가격 변화 속도를 재는 지표군) · RSI, MACD가 속하는 지표 범주. "a momentum oscillator that compares the size of recent gains to recent losses" |
| lookback (period) | 관찰 기간(지표가 되돌아보는 봉 수) · 기본값 14를 가리킬 때. "with a default lookback of 14 periods" |
| RS (relative strength ratio) | 상대강도 비율(RSI 공식 속 평균 상승/평균 하락 비) · 공식 설명에서만 등장. "RS is the Wilder-smoothed average of up-closes divided by..." |
| Wilder's smoothing | Wilder 평활화(단순평균이 아닌 지수형 평활 방식) · RSI·ATR 계산의 핵심 기법. "Wilder's smoothing is not a simple moving average" |
| overbought / oversold | 과매수 / 과매도 · 70/30 밴드가 가리키는 상태, 매도·매수 신호로 오해하기 쉬운 개념. "the textbook overbought/oversold bands" |
| band | 밴드(기준선) · Upper Band/Lower Band, 설정 화면 용어. "edit the Upper Band and Lower Band values" |
| regime | 국면, 장세(강세장/약세장 같은 시장 상태) · RSI 범위가 국면별로 달라짐을 설명할 때. "RSI's effective range shifts with the trend regime" |
| pullback | 눌림목(상승 추세 중 일시 조정) · 히든 다이버전스 설명에 등장. "during an uptrend pullback" |
| bounce | 반등(하락 추세 중 일시 반등) · pullback의 반대짝. "during a downtrend bounce" |
| regular divergence | 일반(클래식) 다이버전스 · 가격과 RSI 고점/저점이 어긋나는 반전 신호. "Regular (classic) divergence is the reversal warning" |
| hidden divergence | 히든 다이버전스 · 추세 지속을 시사하는 반대 유형의 다이버전스. "Hidden divergence points the other way and favors trend continuation" |
| a warning, not a trigger | 경고이지 트리거가 아니다 · 다이버전스를 단독 매매 신호로 쓰면 안 된다는 원칙. "Both are warnings, not triggers" |
| confirmation | 확인(가격 쪽에서 추가로 나와야 하는 근거) · 다이버전스 이후 행동 전 기다리는 것. "wait for a price confirmation" |
| MA (moving average) / MA cross | 이동평균 / 이동평균 교차 · RSI 위에 MA를 올려 신호로 쓸 때. "some traders use for MA-cross signals on momentum" |
| Bollinger Bands standard deviation | 볼린저 밴드 표준편차 · RSI 설정의 평활화 섹션에서 선택적으로 켜는 필드. "an optional Bollinger Bands standard-deviation field" |
| reference rate | 참조 금리(정산에 쓰이는, 관리자·픽싱 시각이 있는 벤치마크) · Jayverse 절에서 RSI와 대비되는 개념. "resolution needs a reference rate or a named venue price" |