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A line plot represents the relationship between 2 variables. The X axis must represent an ordered value. The most common example is to represent time on this axis: then we talk about time series. Since other techniques exist

for time series, it has a dedicated section. Ggplot2 allows to realise this type of chart using the geom_line geometry. A common caveat is to display too many lines on the same chart, resulting in a spaghetti plot which

does not deliver any insight. Thus, consider using small multiples, and note that area chart are often another good alternative to line chart.

 

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Other charts involving line plots


 

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