@thi.ng/transducers-stats

[!NOTE]

This is one of 215 standalone projects. LLM-free, human-made and cared for software, maintained as part of the @thi.ng/umbrella ecosystem and anti-framework.

🚀 Please help me to work full-time on these projects by sponsoring me. Thank you! ❤️

• About
• Supported indicators
• Status
• Installation
• Dependencies
• Usage examples
• API
• Authors
• License

About

Transducers for statistical / technical analysis. This is a support package for @thi.ng/transducers.

This package provides a set of transducers for technical (financial) and statistical analysis and replaces the older @thi.ng/indicators package.

The transducers provided here accept an optional input iterable, which allows them them to be used directly instead of having to wrap their call in one of the transducer execution functions (i.e. transduce(), iterator()). If executed this way, the functions will return a transforming ES6 iterator (generator) instead of a transducer.

Supported indicators

• Bollinger Bands
• Donchian Channel
• EMA (Exponential Moving Average)
• HMA (Hull Moving Average)
• MACD (Moving Average Convergence/Divergence)
• Momentum
• Moving Maximum
• Moving Minimum
• ROC (Rate of change)
• RSI (Relative Strength Index)
• SD (Standard Deviation)
• SMA (Simple Moving Average)
• Stochastic oscillator
• TRIX (Triple smoothed EMA)
• WMA (Weighted Moving Average)

Status

STABLE - used in production

Search or submit any issues for this package

Installation

yarn add @thi.ng/transducers-stats

ESM import:

import * as ts from "@thi.ng/transducers-stats";

Browser ESM import:

<script type="module" src="https://esm.run/@thi.ng/transducers-stats"></script>

JSDelivr documentation

For Node.js REPL:

const ts = await import("@thi.ng/transducers-stats");

Package sizes (brotli'd, pre-treeshake): ESM: 1.76 KB

Dependencies

• @thi.ng/api
• @thi.ng/buffers
• @thi.ng/checks
• @thi.ng/errors
• @thi.ng/transducers

Note: @thi.ng/api is in most cases a type-only import (not used at runtime)

Usage examples

Four projects in this repo's /examples directory are using this package:

Screenshot	Description	Live demo	Source
	ASCII art raymarching with thi.ng/shader-ast & thi.ng/text-canvas	Demo	Source
	Basic crypto-currency candle chart with multiple moving averages plots	Demo	Source
	Optical flow analysis of web cam or video inputs	Demo	Source
	Fork-join worker-based raymarch renderer (JS/CPU only)	Demo	Source

API

Generated API docs

import * as tx from "@thi.ng/transducers";
import * as stats from "@thi.ng/transducers-stats";

// Simple moving average (SMA) (sliding window size 5)
// if an input is given (as is the case here), then returns
// a transforming iterator instead of transducer
[...stats.sma(5, [1,2,3,4,5,10,11,12,13,14,9,8,7,6,5])]
// [ 3, 4.8, 6.6, 8.4, 10.2, 12, 11.8, 11.2, 10.2, 8.8, 7 ]

// compute multiple stats at once
tx.transduce(
    tx.comp(
        tx.multiplexObj({
            sma: stats.sma(5),
            ema: stats.ema(5),
            wma: stats.wma(5)
        }),
        // ignore first `period-1` values
        // (because MAs require at least `period` inputs to warm up)
        tx.drop(4)
    ),
    tx.push(),
    [1,2,3,4,5,10,11,12,13,14,9,8,7,6,5]
);
// [ { wma: 3.6666666666666665, ema: 3, sma: 3 },
//   { wma: 6, ema: 5.333333333333333, sma: 4.8 },
//   { wma: 8.066666666666666, ema: 7.222222222222221, sma: 6.6 },
//   { wma: 9.866666666666667, ema: 8.814814814814815, sma: 8.4 },
//   { wma: 11.4, ema: 10.209876543209877, sma: 10.2 },
//   { wma: 12.666666666666666, ema: 11.473251028806585, sma: 12 },
//   { wma: 11.666666666666666, ema: 10.64883401920439, sma: 11.8 },
//   { wma: 10.4, ema: 9.76588934613626, sma: 11.2 },
//   { wma: 9, ema: 8.843926230757507, sma: 10.2 },
//   { wma: 7.6, ema: 7.895950820505004, sma: 8.8 },
//   { wma: 6.333333333333333, ema: 6.93063388033667, sma: 7 } ]

Authors

• Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-transducers-stats,
  title = "@thi.ng/transducers-stats",
  author = "Karsten Schmidt",
  note = "https://thi.ng/transducers-stats",
  year = 2017
}

License

© 2017 - 2026 Karsten Schmidt // Apache License 2.0