Determining Skewness From A Box Plot. When the median is closer to the top of the box and if the whisker is shorter on the upper end of the box then the distribution is negatively skewed skewed left. Feb 18 2017 Identify Skewness We can also identify the skewness of our data by observing the shape of the box plot.
When the median is closer to the bottom of the box and if the whisker is shorter on the lower end of the box then the distribution is positively skewed skewed right. Follow this up by looking at the Items at a Glance reports. If the longer part of the box is to the right or above the median the data is said to be skewed right.
If the longer part is to the left or below the median the data is skewed left.
X i i th Random Variable. For a distribution that is negatively skewed the box plot will show the median closer to the upper or top quartile. A distribution is considered Positively Skewed. Skewness 0.
