estadisticas/stats.js

Paquete con funciones estadísticas

function average(values) {
    let sum = values.reduce(function(sum, value) {
        return sum + value;
    },0);

    let avg = sum / values.length;
    return avg;
}

function differences(values) {

    let avg = average(values);

    let diffs = values.map(function(value) {
        let diff = value - avg;
        return diff;
    });
    return diffs;

}

function square(values) {

    let sqrs = values.map(function(value) {
        let sqr = value * value;
        return sqr;
    });
    return sqrs;

}

function standardDeviation(values) {
    
    let diffs = differences(values);
    let squarediffs = square(diffs);
    let avgSquareDiffs = average(squarediffs);

    return Math.sqrt(avgSquareDiffs);

}

module.exports.standardDeviation = standardDeviation;
module.exports.average = average;   
module.exports.square = square;
module.exports.differences = differences;