R code_with() function

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What does this line of code mean?

with(epilepsy,by(seizures/timeadj,list(treat,expind),mean))

the data is from the package faraway.

r

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The function with is a convenience function that allows you to access the columns of the data.frame without having to repeat the name of data.frame at all times.

The code:

with(epilepsy, by(seizures/timeadj, list(treat,expind), mean))

It’s the same thing:

by(epilepsy$seizures/epilepsy$timeadj, list(epilepsy$treat, epilepsy$expind), mean)

See that without the with you need to repeat the name of data.frame epilepsy every time you reference your columns.

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