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Describe the differences and similiarities between a stack graph and a line graph.
What is they both track rises and falls over time, and they both take data where each column represents a data series. However, a is a good method for visualizing change in a set of items, where the sum of the values is as important as the individual items whereas a line graph tracks continuous change.
Note: A stack graph is a classic method for visualizing change in a set of items, where the sum of the values is as important as the individual items. A stack graph is excellent for looking at revenue over time across several products, for example. Because a stack graph uses areas to convey numbers, they don't work for negative values. And in some situations it might not make sense to add up different data series (say, prices of different stocks over time). For these cases you may want to use a line graph.