Prerequsites

# load needed libraries
# example from https://bookdown.org/csgillespie/efficientR/set-up.html

pkgs = c("xxx", "yyy", "zzz") # package names

install.packages(pkgs) # used only one time - how to do this?

# installation 
inst = lapply(pkgs, library, character.only = TRUE) # load them

aus Datenbereinigung-2

aus Datenbereinigung-3