update time serie with a seasonality's length of 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 periods

test for a seasonality's length of 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 periods

increase / decrease seasonality's order of magnitude