26
Mar
Skewness Of Box Plots. Most of the wait times are. The box plot helps you see skewness because the line for the median will not be near the center of the box if the data is skewed. Indeed there can be quite different data sets with quite different skewness that will have the same boxplot. If the whisker to the right of the box is longer than the one to the left there is more extreme values towards the positive end and so the distribution is positively skewed.
Skewness and dispersion. When the median is closer to the top of the box and the whisker is shorter on the upper end of the box the distribution is left-skewed or negatively skewed. The plots can have skewness and the median might not be at the center of the box. The usual form of the box plot shown in the graphic shows the 25 and 75 quartiles and at the bottom and top of the box respectively. For a distribution that is positively skewed the box plot will show the median closer to the lower or bottom quartile. In particular taking the log or square root of a data set is often useful for data that exhibit moderate right skewness.
The usual form of the box plot shown in the graphic shows the 25 and 75 quartiles and at the bottom and top of the box respectively.
Indeed there can be quite different data sets with quite different skewness that will have the same boxplot. Or more nearly normal. Most of the wait times are. Box plots visually show the distribution of numerical data and skewness through displaying the data quartiles or percentiles and averages. We can also identify the skewness of our data by observing the shape of the box plot. In descriptive statistics a box plot or boxplot also known as box and whisker plot is a type of chart often used in explanatory data analysis.