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Add an algorithm to find mean absolute deviation #1165

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Merged
merged 6 commits into from
Oct 12, 2022
Merged

Add an algorithm to find mean absolute deviation #1165

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687b505
Add an algorithm to find mean absolute deviation
prashalruchiranga Oct 11, 2022
e98a2f6
Update MeanAbsoluteDeviation.js
prashalruchiranga Oct 11, 2022
d5329c4
Update MeanAbsoluteDeviation.js
prashalruchiranga Oct 11, 2022
3c09bd4
Update MeanAbsoluteDeviation.test.js
prashalruchiranga Oct 11, 2022
65e5fde
Update MeanAbsoluteDeviation.test.js
prashalruchiranga Oct 11, 2022
09c0c67
Updated MeanAbsoluteDeviation.js and MeanAbsoluteDeviation.test.js
prashalruchiranga Oct 11, 2022
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23 changes: 23 additions & 0 deletions Maths/MeanAbsoluteDeviation.js
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Original file line number Diff line number Diff line change
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import { mean } from './AverageMean.js'
/**
*@function meanAbsoluteDeviation
*@description Calculates the mean absolute deviation of list of numbers
* @param {Integer} data
* @returns meanAbsoluteDeviation([2,34,5,0,-2]) = 10.480
* @url https://en.wikipedia.org/wiki/Average_absolute_deviation
*/
function meanAbsoluteDeviation (data) {
if (!Array.isArray(data)) {
throw new TypeError('Invalid Input')
}
let absoluteSum = 0
const meanValue = mean(data)
for (const dataPoint of data) {
absoluteSum += Math.abs(dataPoint - meanValue)
}
return absoluteSum / data.length
}

export {
meanAbsoluteDeviation
}
16 changes: 16 additions & 0 deletions Maths/test/MeanAbsoluteDeviation.test.js
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import { meanAbsoluteDeviation } from '../MeanAbsoluteDeviation.js'

describe('tests for mean absolute deviation', () => {
it('should be a function', () => {
expect(typeof meanAbsoluteDeviation).toEqual('function')
})

it('should throw an invalid input error', () => {
expect(() => meanAbsoluteDeviation('fgh')).toThrow()
})

it('should return the mean absolute devition of an array of numbers', () => {
const meanAbDev = meanAbsoluteDeviation([2, 34, 5, 0, -2])
expect(meanAbDev).toBe(10.479999999999999)
})
})