lsq

        LeastSquaresLinearRegression: function(data, getter) {
            
            // Assign a default trivial case getter:
            if( ! getter) {
                getter = function(row) {
                    return row;
                };
            }
        
            var xy = 0;
            var x = 0, xsq = 0;
            var y = 0;
            var n = 0;
        
            data.forEach(function(pair) {
                pair = getter(pair, n);
            
                xsq += Math.pow(pair[0], 2);
                x   += pair[0];
                y   += pair[1];
                xy  += pair[0] * pair[1];
                ++n;
            });
        
            var b1 = (xy - x * y / n) / (xsq - Math.pow(x, 2) / n);
            var b0 = (y - b1 * x) / n;
        
            return [b0, b1];
        },