Time Series Visualization (I)

STAT679 readings7-1.md

Time Series Visualization (I)

Basic tasks and visual strategies for temporal data

Befor beginning

• Be careful of variation across datasets and variation across tasks
• Based on that, there have been several efforts to systematically taxonomize the types of queries that time series visualizations have been used for.
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Technical details

• Human eyes good at catching information of lines: use geom_line() to create basic lines
• It is useful to draw area plot to emphasize the fact that these are amounts (they must be nonnegative). e.g. trade volume: use geom_area() to create area plot
• For a larger collection of time series: use group_by() and facet_wrap() or facet_grid() to create plots at the same time
• To clearly compare the y values of different sequences: use geom_tile() to create heatmap
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