public function calculate()
{
$v = $this->v;
$w = $this->w;
$x’ = Single::subtract($this->xs, $v);
$y’ = Single::subtract($this->ys, $w);
$parameters = $this->leastSquares($y’, $x’, 1, 0)->getColumn(0);
$this->m = $parameters[0];
$this->b = $this->w - $this->m * $this->v;
$this->parameters = [$this->b, $this->m];
}