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formula
2007 Jul 06
2
access to 'formula' terms in a user function
...(ultimately for some
multidimensional windowing - but this question is on scripting basics). For
purposes of figuring out my needs, lets just consider writing a function
that takes a formula and a dataset, and outputs the mean of each variable in
the formula model. So:
MyFunction <- function(AFormula, ADataFrame) {
...
}
>MyFunction(Y ~ A + B, TheData)
would give results something like:
Mean of MyData$Y is 5.3
Mean of MyData$A is 3.4
Mean of MyData$B is 8.2
QUESTION 1:
How do I determine the terms in the formula within the function?
QUESTION 2:
How do I use one of those terms to...