Box and Whisker Diagram

A box and whisker diagram illustrates a set of data measured on an interval scale. It used in exploratory data analysis and is the type of graph that is used to show the shape of the distribution, its central value, and variability. The picture produced consists of the most extreme values in the data set, (maximum and minimum values), the lower and upper quartiles and the median. Also known as a Box Plot it is especially useful for indicating whether a distribution is skewed and whether there are any unusual observations, (Outliers) in the data set. A Box and Whisker plot is a very useful tool when large numbers of observations are involved and when two or more data sets are being compared.

For more information on Box and Whisker Diagram, click here.