@data-ui/histogram/esm/utils/kernelDensityEstimator.js

React + d3 library for creating histograms

import { mean } from 'd3-array';
/*
 * Kernel density estimator factory which takes a kernel function and input bins
 * as input config and returns a function that takes values of a random variable
 * as input and estimates its probability density function
 * code from https://gist.github.com/mbostock/4341954
 */

export default function kernelDensityEstimator(kernel, bins) {
  return function (values) {
    return bins.map(function (bin) {
      return {
        bin: bin,
        value: mean(values, function (v) {
          return kernel(bin - v);
        })
      };
    });
  };
}