I have rainfall data and lake waterlevel data that I want to plot on the graph. I want to have the 'DATE' on the x-axis, 'RAINFALL' on one y-axis and 'WATERLEVEL' on the other y-axis. How do I go about doing this? Kindly assist
Ideally you don't do it. Double axes are very deceiving.
It is almost always better to do two plots and if necessary present them as two subplots using something like patchwork https://cran.r-project.org/web/packages/patchwork/index.html.
If you really need a double -axis plot have a look at https://www.r-graph-gallery.com/line-chart-dual-Y-axis-ggplot2.html for one way to do it.
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