How do I plot points as graduated/proportional circles in R?

المشرف العام

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I'm back again with more R mapping questions! This one is concerning symbolizing points by a certain attribute with graduated/proportional circles.

DATA: My full code can be found here if you're interested. My CSV of interest is here. Ethiopia shapefile can be downloaded here

I've plotted points from the CSV over a shapefile. For the sake of brevity, here's the heavily abridged version of my code:

library(raster)library(rgdal)#set your working directory#read in eth shapefileeth
 
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