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Added Mean Square Error (#417)

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* Added Mean Square Error

* Update MeanSquareError.js

Co-authored-by: vinayak <itssvinayak@gmail.com>
This commit is contained in:
Stas
2020-10-05 21:18:59 +03:00
committed by GitHub
parent a8fe5e79a8
commit c02fc1f6f6
1 changed files with 26 additions and 0 deletions
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Maths/MeanSquareError.js Normal file
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// Wikipedia: https://en.wikipedia.org/wiki/Mean_squared_error
const meanSquaredError = (predicted, expected) => {
if (!Array.isArray(predicted) || !Array.isArray(expected)) {
throw new TypeError('Argument must be an Array')
}
if (predicted.length !== expected.length) {
throw new TypeError('The two lists must be of equal length')
}
let err = 0
for (let i = 0; i < expected.length; i++) {
err += (expected[i] - predicted[i]) ** 2
}
return err / expected.length
}
// testing
(() => {
console.log(meanSquaredError([1, 2, 3, 4], [1, 2, 3, 4]) === 0)
console.log(meanSquaredError([4, 3, 2, 1], [1, 2, 3, 4]) === 5)
console.log(meanSquaredError([2, 0, 2, 0], [0, 0, 0, 0]) === 3)
})()