var linreg = (function(numbers){
        var a, b, xsum = 0, ysum = 0, xysum = 0, x2sum = 0, y2sum = 0;
        for(var i = 0; i < numbers.length; i++){
            xsum += i;
            ysum += numbers[i];
            xysum += i * numbers[i];
            x2sum += Math.pow(numbers[i], 2);
            y2sum += Math.pow(i, 2);
        }
        a = (ysum * x2sum - xsum * xysum) / (numbers.length * x2sum - Math.pow(xsum, 2));
        b = (numbers.length * xysum - xsum * ysum) / (numbers.length * x2sum - Math.pow(xsum, 2));
        return function(x){
            return a + b * x;
        }
    })(measurements);