Yes, you could use a picture graph to show patterns over time.
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Some graphs do, but some don't. It depends upon the variables.
All graphs show patterns. Bar charts are one way to show comparisons between groups.
Both bar graphs and picture graphs show statistics (data) in a visual (graphic) form.
One advantage of graphing daa in general is to see patterns. Many types of graphs will show patterns. Line graphs are excellent for seeing patterns and trends.
data pictures are graphs.