public function dataProviderForKurtosis()
{
return [[[1987, 1987, 1991, 1992, 1992, 1992, 1992, 1993, 1994, 1994, 1995], -0.2320107], [[0, 7, 7, 6, 6, 6, 5, 5, 4, 1], -0.27315697], [[2, 2, 4, 6, 8, 10, 10], -1.57407407], [[1242, 1353, 1142], -1.5], [[1, 2, 3, 4, 5, 9, 23, 32, 69], 1.389416], [[5, 20, 40, 80, 100], -1.525992], [[4, 5, 5, 5, 5, 6], 0]];
}