How to merge csv and county shape file?

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I have some data in a csv file. One of the interested variable is test done (1=done, 2=not done). There is a variable of county name in which I would like to join with a county shape file.

I only know how to join them using the county file as the base using Arcgis, but the interested variable cannot be summarized correctly (as I would like each county to get a percent of 'done' from the interested variable). How do I join it so I use the csv as a base, and such that I can get a percentage of 'done' later on?



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