If I have a data frame in R:
item, city
1, Turin
2, Rome
3, Napoli
4, Turin
5, Rome
I want to count how many times each city appears and put this number of times in another column that I call counter. How can I do that in R ?
How can I count in R how many times an occurence appears?
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Assuming your data frame is called city.df and the name of the column is city: