Vertical bar charts are useful to compare different categorical or discrete variables, such as age groups, classes, schools, etc., as long as there are not too many categories to compare. Vertical bar chartsīar charts should be used when you are showing segments of information. Even though it is very common today that some software, such as a spreadsheet software or R software, is used to produce charts, it’s still quite useful to know how to create charts by hand. Select an arbitrary but consistent width for each bar as well. The height or length of the bar will represent the number of units or observations in that category (frequency) or simply the value of the variable. When developing bar charts manually, draw a vertical or horizontal bar for each category or value. The numbers on the y-axis of a vertical bar chart or the x-axis of a horizontal bar chart are called the scale. The bars depict frequencies of different values of a variable or simply the different values themselves. They consist of an axis and a series of labelled horizontal or vertical bars. Bar charts are one of the many techniques used to present data in a visual form so that the reader may readily recognize patterns or trends.īar charts usually present categorical variables, discrete variables or continuous variables grouped in class intervals. The important point to note about bar charts is their bar length or height-the greater their length or height, the greater their value. A bar chart may be either horizontal or vertical.
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