Abstract
When we need to represent data or qualitative structures graphically in order to show a relationship—to make a comparison or highlight a trend—we make use of charts. A chart is a graphic structure consisting of symbols, such as lines, in a line chart; bars, in a bar chart; or slices, in a pie chart. Charts serve as valid tools that can help us discern and understand the relationships underlying large quantities of data. It is easier for humans to read graphic representations, such as a chart, than raw numeric data. Nowadays, use of charts has become common practice in a wide variety of professional fields as well as in many other aspects of daily life. For this reason, charts have come to take on many forms, depending on the stucture of the data and the phenomenon that is being highlighted. For example, if you have data separated into different groups and want to represent the percentage of each, with respect to the total, you usually display these groups of data in a pie chart or a bar chart. In contrast, if you want to show the trend of a variable over time, a line chart is typically the best choice.
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