@thi.ng/transducers-stats NPM

npm downloads

This project is part of the @thi.ng/umbrella monorepo.

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

Status

STABLE - used in production

Search or submit any issues for this package

Installation

yarn add @thi.ng/transducers-stats

ES module import:

<script type="module" src="https://cdn.skypack.dev/@thi.ng/transducers-stats"></script>

Skypack documentation

For Node.js REPL:

# with flag only for < v16
node --experimental-repl-await

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

Package sizes (gzipped, pre-treeshake): ESM: 1.21 KB

Dependencies

Usage examples

Several demos in this repo's /examples directory are using this package.

A selection:

Screenshot	Description	Live demo	Source
	Basic crypto-currency candle chart with multiple moving averages plots	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

analysis array bollinger donchian ema macd math moving-average roc sma standard-deviation stochastic trix typescript wma

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

@everything-registry/sub-chunk-914 @thi.ng/hdom-components

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