consider the data (1, 1, 2, 2, 4, 6, 9). it has a median value of 2. the absolute deviations about 2 are (1, 1, 0, 0, 2, 4, 7) which in turn have a median value of 1 (because the sorted absolute deviations are (0, 0, 1, 1, 2, 4, 7)). so the median absolute deviation for this data is 1.