Linear Regression in Javascript [closed]

Answer 1

Here is a snippet that will take an array of triplets (x, y, r) where r is the weight of the (x, y) data point and return [a, b] such that Y = a*X + b approximate the data.

// return (a, b) that minimize
// sum_i r_i * (a*x_i+b - y_i)^2
function linear_regression( xyr )
{
    var i, 
        x, y, r,
        sumx=0, sumy=0, sumx2=0, sumy2=0, sumxy=0, sumr=0,
        a, b;

    for(i=0;i