Take as outliers those points that differ by more than two standard deviations from the median of a surrounding nine-sample window. Output a logical matrix that is true at the locations of the outliers. 샘플 9개로 구성된 주변 윈도우의 중앙값에서 2 표준편차 넘게 차이가 나는 지점을 이상값으로 간주합니다.