regression-polynomial

Polynomial Regression.

Installation

$ npm i ml-regression-polynomial

Usage

import { PolynomialRegression } from 'ml-regression-polynomial';

const x = [50, 50, 50, 70, 70, 70, 80, 80, 80, 90, 90, 90, 100, 100, 100];
const y = [
  3.3, 2.8, 2.9, 2.3, 2.6, 2.1, 2.5, 2.9, 2.4, 3.0, 3.1, 2.8, 3.3, 3.5, 3.0,
];
const degree = 5; // setup the maximum degree of the polynomial

const regression = new PolynomialRegression(x, y, degree);

console.log(regression.predict(80)); // Apply the model to some x value. Prints 2.6.
console.log(regression.coefficients); // Prints the coefficients in increasing order of power (from 0 to degree).
console.log(regression.toString(3)); // Prints a human-readable version of the function.
console.log(regression.toLaTeX());
console.log(regression.score(x, y));

Options

An interceptAtZero option is available, to force $f(0) = 0$. Also, a "powers array" can be specified.

• Using interceptAtZero

const regression = new PolynomialRegression(x, y, degree, {
  interceptAtZero: true,
});

• Using the powers array

const powers = [0, 1, 2, 3, 4, 5];
const regression = new PolynomialRegression(x, y, powers);

powers could also be [1,2,3,4,5]or[1,3,5] and so on.

For intercepting at zero using an array, skip the zero in the array (the option interceptAtZero is ignored in this case.)

License

MIT