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.
Other charts involving line plots
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