最初由 bbrother_bbrothe 发布 TAKE THE FIRST 25 OBSERVATIONS FROM THE ONE AND ONLY APPROPRIATE OF THE FIRST TWO COLUMNS .我觉得这个应该是从COLUMN C2取,因为C1的类型是categorical。就取前25个数据 。
about the 90th percentile. it can also be calculated with an equation given numerous times in the lecture notes. the basic formula is: Percentile = (n+1) * k/100, where "n" represents the number of samples, and "k" represents the Kth percentile -- in this case, 90.