I cannot run the code as I can't install ggplot package. The error message in the console shows that function "ggplot" is not available for this version of R (I have 4.1.2).

I have installed "ggplot2" package, but can't use ggplot function. Any explanation? Thanks.

Sorry, my bad. I didn't do "library(ggplot2)". That is why I couldn't use the function. Please ignore my question. Thanks.

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