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Often functions that work with data.frames have the ability to let the user provide a dataset, so that the user can use its columns in a straight forward way. E.g.:
lm(mpg~cyl+gear,data=mtcars)
Instead of using mtcars$cyl in the formula, we can simply use cyl. How can I implement such behavior in custom built functions?
There are several different techniques for this, described in Standard nonstandard valuation rules.