Skip to content

Added Mean Square Error #417

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
itsvinayak merged 2 commits into from
Oct 5, 2020
Merged

Added Mean Square Error #417

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
7a2ce4b
Added Mean Square Error
RealPeha Oct 5, 2020
1f74b1f
Update MeanSquareError.js
itsvinayak Oct 5, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 26 additions & 0 deletions Maths/MeanSquareError.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
// 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)
})()