What Is a Box Plot?

Box plot refers to a statistical graph describing the distribution of data. It is a graphical method for expressing the minimum, first quartile, median, third quartile, and maximum. It can also roughly see whether the data has symmetry, the degree of dispersion of the distribution, etc., especially it can be used to compare several samples. In boxplots, the upper and lower line segments represent the maximum and minimum values of the data, respectively. The upper and lower line segments of the box plot represent the third quartile and the first quartile, respectively. The thick line segments represent the median of the data. In addition, the upper and lower asterisks and circles in the box plot indicate extreme values in the sample data, respectively. There are generally two types of boxplots: single boxplots are used to analyze data distributions with only one variable, and double boxplots are used to analyze data distributions with two or more variables. ^[1]