public function dataProviderForR2()
{
return [[[1, 2, 4, 5, 6], [2, 3, 5, 7, 8], 0.986049], [[4, 9, 10, 14, 4, 7, 12, 22, 1, 3, 8, 11, 5, 6, 10, 11, 16, 13, 13, 10], [390, 580, 650, 730, 410, 530, 600, 790, 350, 400, 590, 640, 450, 520, 690, 690, 770, 700, 730, 640], 0.87160896]];
}