public function provideKdeMode() { return [[[10, 20, 15, 5], 10, 'silverman', 13.33], [[10, 20], 10, 'silverman', 15.56], [[10, 20, 15, 5], 10, 0.2, 12.5], [[10], 10, 0.1, 10], [[10, 10, 10], 10, 0.1, 10]]; }