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# When do you use a bar graph?

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A bar graph is used to compare items between different groups and track changes over a period of time. Bar graphs are best used for changes that happen over a large amount of time instead of just months or weeks.

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Bar graphs feature rectangular bars with lengths that are directly proportional to the values they represent. A bar graph can be plotted both vertically, which is sometimes referred to as a column bar graph, or horizontally. Bar charts also resemble histograms, which can display a record of continuous data, but the main difference is the type of data that is represented in the two.

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## Related Questions

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A segmented bar graph is similar to regular bar graph except the bars are made of different segments that are represented visually through colored sections. A segmented bar graph is sometimes known as a stacked bar graph, and it offers greater detail about data sets.

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To find the mean, range and mode on a bar graph, analyze both the x- and y-axis. The mode on a bar graph is the value that has the highest bar while the range refers to the difference between the highest and lowest value on the x-axis. The mean can be calculated by multiplying each x-value by its quantity, summing all the results and dividing by the total quantity.

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A double bar graph is a chart that uses parallel bars at proportional lengths that represent quantitative values. The length of the bar correlates with the data.