Momentum

8 algorithms in Technical Indicators · 8 with asserted arithmetic.

In this family#

1. Relative Strength Index (RSI) verified

   Relative strength index: Wilder-smoothed average gain over average loss, mapped to 0–100. In a strong trend a high reading means strength persisting, not exhaustion — which is the most common misreading of this indicator.

   rsi(close, p)
2. Stochastic Oscillator verified

   Where the close sits within the high–low range of the lookback, expressed as 0–100, then smoothed twice.

   stochastic(high, low, close, kp, sk, sd)
3. Stochastic RSI verified

   The stochastic formula applied to RSI rather than to price — a second-order indicator that measures where RSI sits within its own recent range, and therefore moves far faster than either input.

   stochasticRsi(close, rp, sp, sk, sd)
4. Williams %R verified

   Where the close sits within the lookback's high–low range, on a −100…0 scale. Arithmetically the inverse of fast %K.

   williamsR(high, low, close, p)
5. Commodity Channel Index (CCI) verified

   Commodity channel index: the typical price's distance from its moving average, scaled by mean absolute deviation. Unbounded, unlike RSI or the stochastics.

   cci(high, low, close, p, k)
6. Ultimate Oscillator verified

   Weighted buying pressure across three lookbacks at once, which is what makes it less sensitive to the choice of any single period than a plain oscillator.

   ultimateOscillator(high, low, close, s, m, g)
7. True Strength Index (TSI) verified

   True strength index: price change smoothed twice, divided by absolute price change smoothed the same way. The double smoothing is what separates it from a plain momentum reading.

   tsi(close, g, s)
8. Connors RSI verified

   The average of three components: RSI of price, RSI of the up/down streak length, and the percentile rank of the latest return. Designed for short-horizon mean reversion rather than trend.

   connorsRsi(close, pp, sp, rp)

What they share#

Every topic here is a series-transform, so once you have called one the rest follow the same shape. Import paths differ only in the final segment:

import { rsi } from "fintech-algorithms/technical-indicators/momentum/rsi";
import { stochastic } from "fintech-algorithms/technical-indicators/momentum/stochastic-oscillator";

Read them in the order above — the sequence is pedagogical, not alphabetical.

Where this sits#

Technical Indicators collects 37 algorithms across 5 families. For the concept behind this family rather than the call signatures, see the concept guides.