Calculate Wilks coefficient

wilks.js

/*
  Calculate Wilks Coefficient to compare Powerlifting totals across bodyweights
  https://en.wikipedia.org/wiki/Wilks_Coefficient

  wilks(#body_weight, female?);
*/

const men = [
  -216.0475144,
  16.2606339,
  -0.002388645,
  -0.00113732,
  7.01863E-06,
  -1.291E-08
];

const women = [
  594.31747775582,
  -27.23842536447,
  0.82112226871,
  -0.00930733913,
  0.00004731582,
  -0.00000009054
];

const factor = (coeff, w) => (
  coeff.reduce((p, c, i) => p + (c * Math.pow(w, i)))
);

const wilks = (weight, female) => {
  return (500 / factor(female ? women : men, weight));
};

export default wilks;